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authorDavid Conrad <lessen42@gmail.com>2007-06-04 22:10:54 +0000
committerAurelien Jacobs <aurel@gnuage.org>2007-06-04 22:10:54 +0000
commitb061d892edd76bbdb8cf70b244c661f45185b76c (patch)
treededbf96eeba641ffe1f6b8ed69509fc0c50790ab /libavformat/matroskadec.c
parent5449190f531e40d3dc4f8dc49e5c4d5bf08401bd (diff)
split some common code from the mkv demuxer that will be useful to the muxer
patch by David Conrad umovimus _at_ gmail.com Originally committed as revision 9215 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavformat/matroskadec.c')
-rw-r--r--libavformat/matroskadec.c2642
1 files changed, 2642 insertions, 0 deletions
diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
new file mode 100644
index 0000000000..a74944bb38
--- /dev/null
+++ b/libavformat/matroskadec.c
@@ -0,0 +1,2642 @@
+/*
+ * Matroska file demuxer (no muxer yet)
+ * Copyright (c) 2003-2004 The ffmpeg Project
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file matroska.c
+ * Matroska file demuxer
+ * by Ronald Bultje <rbultje@ronald.bitfreak.net>
+ * with a little help from Moritz Bunkus <moritz@bunkus.org>
+ * Specs available on the matroska project page:
+ * http://www.matroska.org/.
+ */
+
+#include "avformat.h"
+/* For codec_get_id(). */
+#include "riff.h"
+#include "intfloat_readwrite.h"
+#include "matroska.h"
+
+typedef struct Track {
+ MatroskaTrackType type;
+
+ /* Unique track number and track ID. stream_index is the index that
+ * the calling app uses for this track. */
+ uint32_t num,
+ uid,
+ stream_index;
+
+ char *name,
+ *language;
+
+ char *codec_id,
+ *codec_name;
+
+ unsigned char *codec_priv;
+ int codec_priv_size;
+
+ uint64_t default_duration;
+ MatroskaTrackFlags flags;
+} MatroskaTrack;
+
+typedef struct MatroskaVideoTrack {
+ MatroskaTrack track;
+
+ int pixel_width,
+ pixel_height,
+ display_width,
+ display_height;
+
+ uint32_t fourcc;
+
+ MatroskaAspectRatioMode ar_mode;
+ MatroskaEyeMode eye_mode;
+
+ //..
+} MatroskaVideoTrack;
+
+typedef struct MatroskaAudioTrack {
+ MatroskaTrack track;
+
+ int channels,
+ bitdepth,
+ internal_samplerate,
+ samplerate;
+ //..
+} MatroskaAudioTrack;
+
+typedef struct MatroskaSubtitleTrack {
+ MatroskaTrack track;
+
+ //..
+} MatroskaSubtitleTrack;
+
+#define MAX_TRACK_SIZE (FFMAX(FFMAX(sizeof(MatroskaVideoTrack), \
+ sizeof(MatroskaAudioTrack)), \
+ sizeof(MatroskaSubtitleTrack)))
+
+typedef struct MatroskaLevel {
+ uint64_t start, length;
+} MatroskaLevel;
+
+typedef struct MatroskaDemuxIndex {
+ uint64_t pos; /* of the corresponding *cluster*! */
+ uint16_t track; /* reference to 'num' */
+ uint64_t time; /* in nanoseconds */
+} MatroskaDemuxIndex;
+
+typedef struct MatroskaDemuxContext {
+ AVFormatContext *ctx;
+
+ /* ebml stuff */
+ int num_levels;
+ MatroskaLevel levels[EBML_MAX_DEPTH];
+ int level_up;
+
+ /* matroska stuff */
+ char *writing_app,
+ *muxing_app;
+ int64_t created;
+
+ /* timescale in the file */
+ int64_t time_scale;
+
+ /* num_streams is the number of streams that av_new_stream() was called
+ * for ( = that are available to the calling program). */
+ int num_tracks, num_streams;
+ MatroskaTrack *tracks[MAX_STREAMS];
+
+ /* cache for ID peeking */
+ uint32_t peek_id;
+
+ /* byte position of the segment inside the stream */
+ offset_t segment_start;
+
+ /* The packet queue. */
+ AVPacket **packets;
+ int num_packets;
+
+ /* have we already parse metadata/cues/clusters? */
+ int metadata_parsed,
+ index_parsed,
+ done;
+
+ /* The index for seeking. */
+ int num_indexes;
+ MatroskaDemuxIndex *index;
+
+ /* What to skip before effectively reading a packet. */
+ int skip_to_keyframe;
+ AVStream *skip_to_stream;
+} MatroskaDemuxContext;
+
+/*
+ * The first few functions handle EBML file parsing. The rest
+ * is the document interpretation. Matroska really just is a
+ * EBML file.
+ */
+
+/*
+ * Return: the amount of levels in the hierarchy that the
+ * current element lies higher than the previous one.
+ * The opposite isn't done - that's auto-done using master
+ * element reading.
+ */
+
+static int
+ebml_read_element_level_up (MatroskaDemuxContext *matroska)
+{
+ ByteIOContext *pb = &matroska->ctx->pb;
+ offset_t pos = url_ftell(pb);
+ int num = 0;
+
+ while (matroska->num_levels > 0) {
+ MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
+
+ if (pos >= level->start + level->length) {
+ matroska->num_levels--;
+ num++;
+ } else {
+ break;
+ }
+ }
+
+ return num;
+}
+
+/*
+ * Read: an "EBML number", which is defined as a variable-length
+ * array of bytes. The first byte indicates the length by giving a
+ * number of 0-bits followed by a one. The position of the first
+ * "one" bit inside the first byte indicates the length of this
+ * number.
+ * Returns: num. of bytes read. < 0 on error.
+ */
+
+static int
+ebml_read_num (MatroskaDemuxContext *matroska,
+ int max_size,
+ uint64_t *number)
+{
+ ByteIOContext *pb = &matroska->ctx->pb;
+ int len_mask = 0x80, read = 1, n = 1;
+ int64_t total = 0;
+
+ /* the first byte tells us the length in bytes - get_byte() can normally
+ * return 0, but since that's not a valid first ebmlID byte, we can
+ * use it safely here to catch EOS. */
+ if (!(total = get_byte(pb))) {
+ /* we might encounter EOS here */
+ if (!url_feof(pb)) {
+ offset_t pos = url_ftell(pb);
+ av_log(matroska->ctx, AV_LOG_ERROR,
+ "Read error at pos. %"PRIu64" (0x%"PRIx64")\n",
+ pos, pos);
+ }
+ return AVERROR_IO; /* EOS or actual I/O error */
+ }
+
+ /* get the length of the EBML number */
+ while (read <= max_size && !(total & len_mask)) {
+ read++;
+ len_mask >>= 1;
+ }
+ if (read > max_size) {
+ offset_t pos = url_ftell(pb) - 1;
+ av_log(matroska->ctx, AV_LOG_ERROR,
+ "Invalid EBML number size tag 0x%02x at pos %"PRIu64" (0x%"PRIx64")\n",
+ (uint8_t) total, pos, pos);
+ return AVERROR_INVALIDDATA;
+ }
+
+ /* read out length */
+ total &= ~len_mask;
+ while (n++ < read)
+ total = (total << 8) | get_byte(pb);
+
+ *number = total;
+
+ return read;
+}
+
+/*
+ * Read: the element content data ID.
+ * Return: the number of bytes read or < 0 on error.
+ */
+
+static int
+ebml_read_element_id (MatroskaDemuxContext *matroska,
+ uint32_t *id,
+ int *level_up)
+{
+ int read;
+ uint64_t total;
+
+ /* if we re-call this, use our cached ID */
+ if (matroska->peek_id != 0) {
+ if (level_up)
+ *level_up = 0;
+ *id = matroska->peek_id;
+ return 0;
+ }
+
+ /* read out the "EBML number", include tag in ID */
+ if ((read = ebml_read_num(matroska, 4, &total)) < 0)
+ return read;
+ *id = matroska->peek_id = total | (1 << (read * 7));
+
+ /* level tracking */
+ if (level_up)
+ *level_up = ebml_read_element_level_up(matroska);
+
+ return read;
+}
+
+/*
+ * Read: element content length.
+ * Return: the number of bytes read or < 0 on error.
+ */
+
+static int
+ebml_read_element_length (MatroskaDemuxContext *matroska,
+ uint64_t *length)
+{
+ /* clear cache since we're now beyond that data point */
+ matroska->peek_id = 0;
+
+ /* read out the "EBML number", include tag in ID */
+ return ebml_read_num(matroska, 8, length);
+}
+
+/*
+ * Return: the ID of the next element, or 0 on error.
+ * Level_up contains the amount of levels that this
+ * next element lies higher than the previous one.
+ */
+
+static uint32_t
+ebml_peek_id (MatroskaDemuxContext *matroska,
+ int *level_up)
+{
+ uint32_t id;
+
+ assert(level_up != NULL);
+
+ if (ebml_read_element_id(matroska, &id, level_up) < 0)
+ return 0;
+
+ return id;
+}
+
+/*
+ * Seek to a given offset.
+ * 0 is success, -1 is failure.
+ */
+
+static int
+ebml_read_seek (MatroskaDemuxContext *matroska,
+ offset_t offset)
+{
+ ByteIOContext *pb = &matroska->ctx->pb;
+
+ /* clear ID cache, if any */
+ matroska->peek_id = 0;
+
+ return (url_fseek(pb, offset, SEEK_SET) == offset) ? 0 : -1;
+}
+
+/*
+ * Skip the next element.
+ * 0 is success, -1 is failure.
+ */
+
+static int
+ebml_read_skip (MatroskaDemuxContext *matroska)
+{
+ ByteIOContext *pb = &matroska->ctx->pb;
+ uint32_t id;
+ uint64_t length;
+ int res;
+
+ if ((res = ebml_read_element_id(matroska, &id, NULL)) < 0 ||
+ (res = ebml_read_element_length(matroska, &length)) < 0)
+ return res;
+
+ url_fskip(pb, length);
+
+ return 0;
+}
+
+/*
+ * Read the next element as an unsigned int.
+ * 0 is success, < 0 is failure.
+ */
+
+static int
+ebml_read_uint (MatroskaDemuxContext *matroska,
+ uint32_t *id,
+ uint64_t *num)
+{
+ ByteIOContext *pb = &matroska->ctx->pb;
+ int n = 0, size, res;
+ uint64_t rlength;
+
+ if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
+ (res = ebml_read_element_length(matroska, &rlength)) < 0)
+ return res;
+ size = rlength;
+ if (size < 1 || size > 8) {
+ offset_t pos = url_ftell(pb);
+ av_log(matroska->ctx, AV_LOG_ERROR,
+ "Invalid uint element size %d at position %"PRId64" (0x%"PRIx64")\n",
+ size, pos, pos);
+ return AVERROR_INVALIDDATA;
+ }
+
+ /* big-endian ordening; build up number */
+ *num = 0;
+ while (n++ < size)
+ *num = (*num << 8) | get_byte(pb);
+
+ return 0;
+}
+
+/*
+ * Read the next element as a signed int.
+ * 0 is success, < 0 is failure.
+ */
+
+static int
+ebml_read_sint (MatroskaDemuxContext *matroska,
+ uint32_t *id,
+ int64_t *num)
+{
+ ByteIOContext *pb = &matroska->ctx->pb;
+ int size, n = 1, negative = 0, res;
+ uint64_t rlength;
+
+ if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
+ (res = ebml_read_element_length(matroska, &rlength)) < 0)
+ return res;
+ size = rlength;
+ if (size < 1 || size > 8) {
+ offset_t pos = url_ftell(pb);
+ av_log(matroska->ctx, AV_LOG_ERROR,
+ "Invalid sint element size %d at position %"PRId64" (0x%"PRIx64")\n",
+ size, pos, pos);
+ return AVERROR_INVALIDDATA;
+ }
+ if ((*num = get_byte(pb)) & 0x80) {
+ negative = 1;
+ *num &= ~0x80;
+ }
+ while (n++ < size)
+ *num = (*num << 8) | get_byte(pb);
+
+ /* make signed */
+ if (negative)
+ *num = *num - (1LL << ((8 * size) - 1));
+
+ return 0;
+}
+
+/*
+ * Read the next element as a float.
+ * 0 is success, < 0 is failure.
+ */
+
+static int
+ebml_read_float (MatroskaDemuxContext *matroska,
+ uint32_t *id,
+ double *num)
+{
+ ByteIOContext *pb = &matroska->ctx->pb;
+ int size, res;
+ uint64_t rlength;
+
+ if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
+ (res = ebml_read_element_length(matroska, &rlength)) < 0)
+ return res;
+ size = rlength;
+
+ if (size == 4) {
+ *num= av_int2flt(get_be32(pb));
+ } else if(size==8){
+ *num= av_int2dbl(get_be64(pb));
+ } else{
+ offset_t pos = url_ftell(pb);
+ av_log(matroska->ctx, AV_LOG_ERROR,
+ "Invalid float element size %d at position %"PRIu64" (0x%"PRIx64")\n",
+ size, pos, pos);
+ return AVERROR_INVALIDDATA;
+ }
+
+ return 0;
+}
+
+/*
+ * Read the next element as an ASCII string.
+ * 0 is success, < 0 is failure.
+ */
+
+static int
+ebml_read_ascii (MatroskaDemuxContext *matroska,
+ uint32_t *id,
+ char **str)
+{
+ ByteIOContext *pb = &matroska->ctx->pb;
+ int size, res;
+ uint64_t rlength;
+
+ if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
+ (res = ebml_read_element_length(matroska, &rlength)) < 0)
+ return res;
+ size = rlength;
+
+ /* ebml strings are usually not 0-terminated, so we allocate one
+ * byte more, read the string and NULL-terminate it ourselves. */
+ if (size < 0 || !(*str = av_malloc(size + 1))) {
+ av_log(matroska->ctx, AV_LOG_ERROR, "Memory allocation failed\n");
+ return AVERROR_NOMEM;
+ }
+ if (get_buffer(pb, (uint8_t *) *str, size) != size) {
+ offset_t pos = url_ftell(pb);
+ av_log(matroska->ctx, AV_LOG_ERROR,
+ "Read error at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
+ return AVERROR_IO;
+ }
+ (*str)[size] = '\0';
+
+ return 0;
+}
+
+/*
+ * Read the next element as a UTF-8 string.
+ * 0 is success, < 0 is failure.
+ */
+
+static int
+ebml_read_utf8 (MatroskaDemuxContext *matroska,
+ uint32_t *id,
+ char **str)
+{
+ return ebml_read_ascii(matroska, id, str);
+}
+
+/*
+ * Read the next element as a date (nanoseconds since 1/1/2000).
+ * 0 is success, < 0 is failure.
+ */
+
+static int
+ebml_read_date (MatroskaDemuxContext *matroska,
+ uint32_t *id,
+ int64_t *date)
+{
+ return ebml_read_sint(matroska, id, date);
+}
+
+/*
+ * Read the next element, but only the header. The contents
+ * are supposed to be sub-elements which can be read separately.
+ * 0 is success, < 0 is failure.
+ */
+
+static int
+ebml_read_master (MatroskaDemuxContext *matroska,
+ uint32_t *id)
+{
+ ByteIOContext *pb = &matroska->ctx->pb;
+ uint64_t length;
+ MatroskaLevel *level;
+ int res;
+
+ if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
+ (res = ebml_read_element_length(matroska, &length)) < 0)
+ return res;
+
+ /* protect... (Heaven forbids that the '>' is true) */
+ if (matroska->num_levels >= EBML_MAX_DEPTH) {
+ av_log(matroska->ctx, AV_LOG_ERROR,
+ "File moves beyond max. allowed depth (%d)\n", EBML_MAX_DEPTH);
+ return AVERROR_NOTSUPP;
+ }
+
+ /* remember level */
+ level = &matroska->levels[matroska->num_levels++];
+ level->start = url_ftell(pb);
+ level->length = length;
+
+ return 0;
+}
+
+/*
+ * Read the next element as binary data.
+ * 0 is success, < 0 is failure.
+ */
+
+static int
+ebml_read_binary (MatroskaDemuxContext *matroska,
+ uint32_t *id,
+ uint8_t **binary,
+ int *size)
+{
+ ByteIOContext *pb = &matroska->ctx->pb;
+ uint64_t rlength;
+ int res;
+
+ if ((res = ebml_read_element_id(matroska, id, NULL)) < 0 ||
+ (res = ebml_read_element_length(matroska, &rlength)) < 0)
+ return res;
+ *size = rlength;
+
+ if (!(*binary = av_malloc(*size))) {
+ av_log(matroska->ctx, AV_LOG_ERROR,
+ "Memory allocation error\n");
+ return AVERROR_NOMEM;
+ }
+
+ if (get_buffer(pb, *binary, *size) != *size) {
+ offset_t pos = url_ftell(pb);
+ av_log(matroska->ctx, AV_LOG_ERROR,
+ "Read error at pos. %"PRIu64" (0x%"PRIx64")\n", pos, pos);
+ return AVERROR_IO;
+ }
+
+ return 0;
+}
+
+/*
+ * Read signed/unsigned "EBML" numbers.
+ * Return: number of bytes processed, < 0 on error.
+ * XXX: use ebml_read_num().
+ */
+
+static int
+matroska_ebmlnum_uint (uint8_t *data,
+ uint32_t size,
+ uint64_t *num)
+{
+ int len_mask = 0x80, read = 1, n = 1, num_ffs = 0;
+ uint64_t total;
+
+ if (size <= 0)
+ return AVERROR_INVALIDDATA;
+
+ total = data[0];
+ while (read <= 8 && !(total & len_mask)) {
+ read++;
+ len_mask >>= 1;
+ }
+ if (read > 8)
+ return AVERROR_INVALIDDATA;
+
+ if ((total &= (len_mask - 1)) == len_mask - 1)
+ num_ffs++;
+ if (size < read)
+ return AVERROR_INVALIDDATA;
+ while (n < read) {
+ if (data[n] == 0xff)
+ num_ffs++;
+ total = (total << 8) | data[n];
+ n++;
+ }
+
+ if (read == num_ffs)
+ *num = (uint64_t)-1;
+ else
+ *num = total;
+
+ return read;
+}
+
+/*
+ * Same as above, but signed.
+ */
+
+static int
+matroska_ebmlnum_sint (uint8_t *data,
+ uint32_t size,
+ int64_t *num)
+{
+ uint64_t unum;
+ int res;
+
+ /* read as unsigned number first */
+ if ((res = matroska_ebmlnum_uint(data, size, &unum)) < 0)
+ return res;
+
+ /* make signed (weird way) */
+ if (unum == (uint64_t)-1)
+ *num = INT64_MAX;
+ else
+ *num = unum - ((1LL << ((7 * res) - 1)) - 1);
+
+ return res;
+}
+
+/*
+ * Read an EBML header.
+ * 0 is success, < 0 is failure.
+ */
+
+static int
+ebml_read_header (MatroskaDemuxContext *matroska,
+ char **doctype,
+ int *version)
+{
+ uint32_t id;
+ int level_up, res = 0;
+
+ /* default init */
+ if (doctype)
+ *doctype = NULL;
+ if (version)
+ *version = 1;
+
+ if (!(id = ebml_peek_id(matroska, &level_up)) ||
+ level_up != 0 || id != EBML_ID_HEADER) {
+ av_log(matroska->ctx, AV_LOG_ERROR,
+ "This is not an EBML file (id=0x%x/0x%x)\n", id, EBML_ID_HEADER);
+ return AVERROR_INVALIDDATA;
+ }
+ if ((res = ebml_read_master(matroska, &id)) < 0)
+ return res;
+
+ while (res == 0) {
+ if (!(id = ebml_peek_id(matroska, &level_up)))
+ return AVERROR_IO;
+
+ /* end-of-header */
+ if (level_up)
+ break;
+
+ switch (id) {
+ /* is our read version uptodate? */
+ case EBML_ID_EBMLREADVERSION: {
+ uint64_t num;
+
+ if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
+ return res;
+ if (num > EBML_VERSION) {
+ av_log(matroska->ctx, AV_LOG_ERROR,
+ "EBML version %"PRIu64" (> %d) is not supported\n",
+ num, EBML_VERSION);
+ return AVERROR_INVALIDDATA;
+ }
+ break;
+ }
+
+ /* we only handle 8 byte lengths at max */
+ case EBML_ID_EBMLMAXSIZELENGTH: {
+ uint64_t num;
+
+ if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
+ return res;
+ if (num > sizeof(uint64_t)) {
+ av_log(matroska->ctx, AV_LOG_ERROR,
+ "Integers of size %"PRIu64" (> %zd) not supported\n",
+ num, sizeof(uint64_t));
+ return AVERROR_INVALIDDATA;
+ }
+ break;
+ }
+
+ /* we handle 4 byte IDs at max */
+ case EBML_ID_EBMLMAXIDLENGTH: {
+ uint64_t num;
+
+ if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
+ return res;
+ if (num > sizeof(uint32_t)) {
+ av_log(matroska->ctx, AV_LOG_ERROR,
+ "IDs of size %"PRIu64" (> %zu) not supported\n",
+ num, sizeof(uint32_t));
+ return AVERROR_INVALIDDATA;
+ }
+ break;
+ }
+
+ case EBML_ID_DOCTYPE: {
+ char *text;
+
+ if ((res = ebml_read_ascii(matroska, &id, &text)) < 0)
+ return res;
+ if (doctype) {
+ if (*doctype)
+ av_free(*doctype);
+ *doctype = text;
+ } else
+ av_free(text);
+ break;
+ }
+
+ case EBML_ID_DOCTYPEREADVERSION: {
+ uint64_t num;
+
+ if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
+ return res;
+ if (version)
+ *version = num;
+ break;
+ }
+
+ default:
+ av_log(matroska->ctx, AV_LOG_INFO,
+ "Unknown data type 0x%x in EBML header", id);
+ /* pass-through */
+
+ case EBML_ID_VOID:
+ /* we ignore these two, as they don't tell us anything we
+ * care about */
+ case EBML_ID_EBMLVERSION:
+ case EBML_ID_DOCTYPEVERSION:
+ res = ebml_read_skip (matroska);
+ break;
+ }
+ }
+
+ return 0;
+}
+
+
+static int
+matroska_find_track_by_num (MatroskaDemuxContext *matroska,
+ int num)
+{
+ int i;
+
+ for (i = 0; i < matroska->num_tracks; i++)
+ if (matroska->tracks[i]->num == num)
+ return i;
+
+ return -1;
+}
+
+
+/*
+ * Put one packet in an application-supplied AVPacket struct.
+ * Returns 0 on success or -1 on failure.
+ */
+
+static int
+matroska_deliver_packet (MatroskaDemuxContext *matroska,
+ AVPacket *pkt)
+{
+ if (matroska->num_packets > 0) {
+ memcpy(pkt, matroska->packets[0], sizeof(AVPacket));
+ av_free(matroska->packets[0]);
+ if (matroska->num_packets > 1) {
+ memmove(&matroska->packets[0], &matroska->packets[1],
+ (matroska->num_packets - 1) * sizeof(AVPacket *));
+ matroska->packets =
+ av_realloc(matroska->packets, (matroska->num_packets - 1) *
+ sizeof(AVPacket *));
+ } else {
+ av_freep(&matroska->packets);
+ }
+ matroska->num_packets--;
+ return 0;
+ }
+
+ return -1;
+}
+
+/*
+ * Put a packet into our internal queue. Will be delivered to the
+ * user/application during the next get_packet() call.
+ */
+
+static void
+matroska_queue_packet (MatroskaDemuxContext *matroska,
+ AVPacket *pkt)
+{
+ matroska->packets =
+ av_realloc(matroska->packets, (matroska->num_packets + 1) *
+ sizeof(AVPacket *));
+ matroska->packets[matroska->num_packets] = pkt;
+ matroska->num_packets++;
+}
+
+
+/*
+ * Autodetecting...
+ */
+
+static int
+matroska_probe (AVProbeData *p)
+{
+ uint64_t total = 0;
+ int len_mask = 0x80, size = 1, n = 1;
+ uint8_t probe_data[] = { 'm', 'a', 't', 'r', 'o', 's', 'k', 'a' };
+
+ /* ebml header? */
+ if ((p->buf[0] << 24 | p->buf[1] << 16 |
+ p->buf[2] << 8 | p->buf[3]) != EBML_ID_HEADER)
+ return 0;
+
+ /* length of header */
+ total = p->buf[4];
+ while (size <= 8 && !(total & len_mask)) {
+ size++;
+ len_mask >>= 1;
+ }
+ if (size > 8)
+ return 0;
+ total &= (len_mask - 1);
+ while (n < size)
+ total = (total << 8) | p->buf[4 + n++];
+
+ /* does the probe data contain the whole header? */
+ if (p->buf_size < 4 + size + total)
+ return 0;
+
+ /* the header must contain the document type 'matroska'. For now,
+ * we don't parse the whole header but simply check for the
+ * availability of that array of characters inside the header.
+ * Not fully fool-proof, but good enough. */
+ for (n = 4 + size; n <= 4 + size + total - sizeof(probe_data); n++)
+ if (!memcmp (&p->buf[n], probe_data, sizeof(probe_data)))
+ return AVPROBE_SCORE_MAX;
+
+ return 0;
+}
+
+/*
+ * From here on, it's all XML-style DTD stuff... Needs no comments.
+ */
+
+static int
+matroska_parse_info (MatroskaDemuxContext *matroska)
+{
+ int res = 0;
+ uint32_t id;
+
+ av_log(matroska->ctx, AV_LOG_DEBUG, "Parsing info...\n");
+
+ while (res == 0) {
+ if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
+ res = AVERROR_IO;
+ break;
+ } else if (matroska->level_up) {
+ matroska->level_up--;
+ break;
+ }
+
+ switch (id) {
+ /* cluster timecode */
+ case MATROSKA_ID_TIMECODESCALE: {
+ uint64_t num;
+ if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
+ break;
+ matroska->time_scale = num;
+ break;
+ }
+
+ case MATROSKA_ID_DURATION: {
+ double num;
+ if ((res = ebml_read_float(matroska, &id, &num)) < 0)
+ break;
+ matroska->ctx->duration = num * matroska->time_scale * 1000 / AV_TIME_BASE;
+ break;
+ }
+
+ case MATROSKA_ID_TITLE: {
+ char *text;
+ if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
+ break;
+ strncpy(matroska->ctx->title, text,
+ sizeof(matroska->ctx->title)-1);
+ av_free(text);
+ break;
+ }
+
+ case MATROSKA_ID_WRITINGAPP: {
+ char *text;
+ if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
+ break;
+ matroska->writing_app = text;
+ break;
+ }
+
+ case MATROSKA_ID_MUXINGAPP: {
+ char *text;
+ if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
+ break;
+ matroska->muxing_app = text;
+ break;
+ }
+
+ case MATROSKA_ID_DATEUTC: {
+ int64_t time;
+ if ((res = ebml_read_date(matroska, &id, &time)) < 0)
+ break;
+ matroska->created = time;
+ break;
+ }
+
+ default:
+ av_log(matroska->ctx, AV_LOG_INFO,
+ "Unknown entry 0x%x in info header\n", id);
+ /* fall-through */
+
+ case EBML_ID_VOID:
+ res = ebml_read_skip(matroska);
+ break;
+ }
+
+ if (matroska->level_up) {
+ matroska->level_up--;
+ break;
+ }
+ }
+
+ return res;
+}
+
+static int
+matroska_add_stream (MatroskaDemuxContext *matroska)
+{
+ int res = 0;
+ uint32_t id;
+ MatroskaTrack *track;
+
+ av_log(matroska->ctx, AV_LOG_DEBUG, "parsing track, adding stream..,\n");
+
+ /* Allocate a generic track. As soon as we know its type we'll realloc. */
+ track = av_mallocz(MAX_TRACK_SIZE);
+ matroska->num_tracks++;
+
+ /* start with the master */
+ if ((res = ebml_read_master(matroska, &id)) < 0)
+ return res;
+
+ /* try reading the trackentry headers */
+ while (res == 0) {
+ if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
+ res = AVERROR_IO;
+ break;
+ } else if (matroska->level_up > 0) {
+ matroska->level_up--;
+ break;
+ }
+
+ switch (id) {
+ /* track number (unique stream ID) */
+ case MATROSKA_ID_TRACKNUMBER: {
+ uint64_t num;
+ if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
+ break;
+ track->num = num;
+ break;
+ }
+
+ /* track UID (unique identifier) */
+ case MATROSKA_ID_TRACKUID: {
+ uint64_t num;
+ if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
+ break;
+ track->uid = num;
+ break;
+ }
+
+ /* track type (video, audio, combined, subtitle, etc.) */
+ case MATROSKA_ID_TRACKTYPE: {
+ uint64_t num;
+ if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
+ break;
+ if (track->type && track->type != num) {
+ av_log(matroska->ctx, AV_LOG_INFO,
+ "More than one tracktype in an entry - skip\n");
+ break;
+ }
+ track->type = num;
+
+ switch (track->type) {
+ case MATROSKA_TRACK_TYPE_VIDEO:
+ case MATROSKA_TRACK_TYPE_AUDIO:
+ case MATROSKA_TRACK_TYPE_SUBTITLE:
+ break;
+ case MATROSKA_TRACK_TYPE_COMPLEX:
+ case MATROSKA_TRACK_TYPE_LOGO:
+ case MATROSKA_TRACK_TYPE_CONTROL:
+ default:
+ av_log(matroska->ctx, AV_LOG_INFO,
+ "Unknown or unsupported track type 0x%x\n",
+ track->type);
+ track->type = 0;
+ break;
+ }
+ matroska->tracks[matroska->num_tracks - 1] = track;
+ break;
+ }
+
+ /* tracktype specific stuff for video */
+ case MATROSKA_ID_TRACKVIDEO: {
+ MatroskaVideoTrack *videotrack;
+ if (!track->type)
+ track->type = MATROSKA_TRACK_TYPE_VIDEO;
+ if (track->type != MATROSKA_TRACK_TYPE_VIDEO) {
+ av_log(matroska->ctx, AV_LOG_INFO,
+ "video data in non-video track - ignoring\n");
+ res = AVERROR_INVALIDDATA;
+ break;
+ } else if ((res = ebml_read_master(matroska, &id)) < 0)
+ break;
+ videotrack = (MatroskaVideoTrack *)track;
+
+ while (res == 0) {
+ if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
+ res = AVERROR_IO;
+ break;
+ } else if (matroska->level_up > 0) {
+ matroska->level_up--;
+ break;
+ }
+
+ switch (id) {
+ /* fixme, this should be one-up, but I get it here */
+ case MATROSKA_ID_TRACKDEFAULTDURATION: {
+ uint64_t num;
+ if ((res = ebml_read_uint (matroska, &id,
+ &num)) < 0)
+ break;
+ track->default_duration = num/matroska->time_scale;
+ break;
+ }
+
+ /* video framerate */
+ case MATROSKA_ID_VIDEOFRAMERATE: {
+ double num;
+ if ((res = ebml_read_float(matroska, &id,
+ &num)) < 0)
+ break;
+ track->default_duration = 1000000000/(matroska->time_scale*num);
+ break;
+ }
+
+ /* width of the size to display the video at */
+ case MATROSKA_ID_VIDEODISPLAYWIDTH: {
+ uint64_t num;
+ if ((res = ebml_read_uint(matroska, &id,
+ &num)) < 0)
+ break;
+ videotrack->display_width = num;
+ break;
+ }
+
+ /* height of the size to display the video at */
+ case MATROSKA_ID_VIDEODISPLAYHEIGHT: {
+ uint64_t num;
+ if ((res = ebml_read_uint(matroska, &id,
+ &num)) < 0)
+ break;
+ videotrack->display_height = num;
+ break;
+ }
+
+ /* width of the video in the file */
+ case MATROSKA_ID_VIDEOPIXELWIDTH: {
+ uint64_t num;
+ if ((res = ebml_read_uint(matroska, &id,
+ &num)) < 0)
+ break;
+ videotrack->pixel_width = num;
+ break;
+ }
+
+ /* height of the video in the file */
+ case MATROSKA_ID_VIDEOPIXELHEIGHT: {
+ uint64_t num;
+ if ((res = ebml_read_uint(matroska, &id,
+ &num)) < 0)
+ break;
+ videotrack->pixel_height = num;
+ break;
+ }
+
+ /* whether the video is interlaced */
+ case MATROSKA_ID_VIDEOFLAGINTERLACED: {
+ uint64_t num;
+ if ((res = ebml_read_uint(matroska, &id,
+ &num)) < 0)
+ break;
+ if (num)
+ track->flags |=
+ MATROSKA_VIDEOTRACK_INTERLACED;
+ else
+ track->flags &=
+ ~MATROSKA_VIDEOTRACK_INTERLACED;
+ break;
+ }
+
+ /* stereo mode (whether the video has two streams,
+ * where one is for the left eye and the other for
+ * the right eye, which creates a 3D-like
+ * effect) */
+ case MATROSKA_ID_VIDEOSTEREOMODE: {
+ uint64_t num;
+ if ((res = ebml_read_uint(matroska, &id,
+ &num)) < 0)
+ break;
+ if (num != MATROSKA_EYE_MODE_MONO &&
+ num != MATROSKA_EYE_MODE_LEFT &&
+ num != MATROSKA_EYE_MODE_RIGHT &&
+ num != MATROSKA_EYE_MODE_BOTH) {
+ av_log(matroska->ctx, AV_LOG_INFO,
+ "Ignoring unknown eye mode 0x%x\n",
+ (uint32_t) num);
+ break;
+ }
+ videotrack->eye_mode = num;
+ break;
+ }
+
+ /* aspect ratio behaviour */
+ case MATROSKA_ID_VIDEOASPECTRATIO: {
+ uint64_t num;
+ if ((res = ebml_read_uint(matroska, &id,
+ &num)) < 0)
+ break;
+ if (num != MATROSKA_ASPECT_RATIO_MODE_FREE &&
+ num != MATROSKA_ASPECT_RATIO_MODE_KEEP &&
+ num != MATROSKA_ASPECT_RATIO_MODE_FIXED) {
+ av_log(matroska->ctx, AV_LOG_INFO,
+ "Ignoring unknown aspect ratio 0x%x\n",
+ (uint32_t) num);
+ break;
+ }
+ videotrack->ar_mode = num;
+ break;
+ }
+
+ /* colourspace (only matters for raw video)
+ * fourcc */
+ case MATROSKA_ID_VIDEOCOLOURSPACE: {
+ uint64_t num;
+ if ((res = ebml_read_uint(matroska, &id,
+ &num)) < 0)
+ break;
+ videotrack->fourcc = num;
+ break;
+ }
+
+ default:
+ av_log(matroska->ctx, AV_LOG_INFO,
+ "Unknown video track header entry "
+ "0x%x - ignoring\n", id);
+ /* pass-through */
+
+ case EBML_ID_VOID:
+ res = ebml_read_skip(matroska);
+ break;
+ }
+
+ if (matroska->level_up) {
+ matroska->level_up--;
+ break;
+ }
+ }
+ break;
+ }
+
+ /* tracktype specific stuff for audio */
+ case MATROSKA_ID_TRACKAUDIO: {
+ MatroskaAudioTrack *audiotrack;
+ if (!track->type)
+ track->type = MATROSKA_TRACK_TYPE_AUDIO;
+ if (track->type != MATROSKA_TRACK_TYPE_AUDIO) {
+ av_log(matroska->ctx, AV_LOG_INFO,
+ "audio data in non-audio track - ignoring\n");
+ res = AVERROR_INVALIDDATA;
+ break;
+ } else if ((res = ebml_read_master(matroska, &id)) < 0)
+ break;
+ audiotrack = (MatroskaAudioTrack *)track;
+ audiotrack->channels = 1;
+ audiotrack->samplerate = 8000;
+
+ while (res == 0) {
+ if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
+ res = AVERROR_IO;
+ break;
+ } else if (matroska->level_up > 0) {
+ matroska->level_up--;
+ break;
+ }
+
+ switch (id) {
+ /* samplerate */
+ case MATROSKA_ID_AUDIOSAMPLINGFREQ: {
+ double num;
+ if ((res = ebml_read_float(matroska, &id,
+ &num)) < 0)
+ break;
+ audiotrack->internal_samplerate =
+ audiotrack->samplerate = num;
+ break;
+ }
+
+ case MATROSKA_ID_AUDIOOUTSAMPLINGFREQ: {
+ double num;
+ if ((res = ebml_read_float(matroska, &id,
+ &num)) < 0)
+ break;
+ audiotrack->samplerate = num;
+ break;
+ }
+
+ /* bitdepth */
+ case MATROSKA_ID_AUDIOBITDEPTH: {
+ uint64_t num;
+ if ((res = ebml_read_uint(matroska, &id,
+ &num)) < 0)
+ break;
+ audiotrack->bitdepth = num;
+ break;
+ }
+
+ /* channels */
+ case MATROSKA_ID_AUDIOCHANNELS: {
+ uint64_t num;
+ if ((res = ebml_read_uint(matroska, &id,
+ &num)) < 0)
+ break;
+ audiotrack->channels = num;
+ break;
+ }
+
+ default:
+ av_log(matroska->ctx, AV_LOG_INFO,
+ "Unknown audio track header entry "
+ "0x%x - ignoring\n", id);
+ /* pass-through */
+
+ case EBML_ID_VOID:
+ res = ebml_read_skip(matroska);
+ break;
+ }
+
+ if (matroska->level_up) {
+ matroska->level_up--;
+ break;
+ }
+ }
+ break;
+ }
+
+ /* codec identifier */
+ case MATROSKA_ID_CODECID: {
+ char *text;
+ if ((res = ebml_read_ascii(matroska, &id, &text)) < 0)
+ break;
+ track->codec_id = text;
+ break;
+ }
+
+ /* codec private data */
+ case MATROSKA_ID_CODECPRIVATE: {
+ uint8_t *data;
+ int size;
+ if ((res = ebml_read_binary(matroska, &id, &data, &size) < 0))
+ break;
+ track->codec_priv = data;
+ track->codec_priv_size = size;
+ break;
+ }
+
+ /* name of the codec */
+ case MATROSKA_ID_CODECNAME: {
+ char *text;
+ if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
+ break;
+ track->codec_name = text;
+ break;
+ }
+
+ /* name of this track */
+ case MATROSKA_ID_TRACKNAME: {
+ char *text;
+ if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
+ break;
+ track->name = text;
+ break;
+ }
+
+ /* language (matters for audio/subtitles, mostly) */
+ case MATROSKA_ID_TRACKLANGUAGE: {
+ char *text;
+ if ((res = ebml_read_utf8(matroska, &id, &text)) < 0)
+ break;
+ track->language = text;
+ break;
+ }
+
+ /* whether this is actually used */
+ case MATROSKA_ID_TRACKFLAGENABLED: {
+ uint64_t num;
+ if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
+ break;
+ if (num)
+ track->flags |= MATROSKA_TRACK_ENABLED;
+ else
+ track->flags &= ~MATROSKA_TRACK_ENABLED;
+ break;
+ }
+
+ /* whether it's the default for this track type */
+ case MATROSKA_ID_TRACKFLAGDEFAULT: {
+ uint64_t num;
+ if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
+ break;
+ if (num)
+ track->flags |= MATROSKA_TRACK_DEFAULT;
+ else
+ track->flags &= ~MATROSKA_TRACK_DEFAULT;
+ break;
+ }
+
+ /* lacing (like MPEG, where blocks don't end/start on frame
+ * boundaries) */
+ case MATROSKA_ID_TRACKFLAGLACING: {
+ uint64_t num;
+ if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
+ break;
+ if (num)
+ track->flags |= MATROSKA_TRACK_LACING;
+ else
+ track->flags &= ~MATROSKA_TRACK_LACING;
+ break;
+ }
+
+ /* default length (in time) of one data block in this track */
+ case MATROSKA_ID_TRACKDEFAULTDURATION: {
+ uint64_t num;
+ if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
+ break;
+ track->default_duration = num / matroska->time_scale;
+ break;
+ }
+
+ default:
+ av_log(matroska->ctx, AV_LOG_INFO,
+ "Unknown track header entry 0x%x - ignoring\n", id);
+ /* pass-through */
+
+ case EBML_ID_VOID:
+ /* we ignore these because they're nothing useful. */
+ case MATROSKA_ID_CODECINFOURL:
+ case MATROSKA_ID_CODECDOWNLOADURL:
+ case MATROSKA_ID_TRACKMINCACHE:
+ case MATROSKA_ID_TRACKMAXCACHE:
+ res = ebml_read_skip(matroska);
+ break;
+ }
+
+ if (matroska->level_up) {
+ matroska->level_up--;
+ break;
+ }
+ }
+
+ return res;
+}
+
+static int
+matroska_parse_tracks (MatroskaDemuxContext *matroska)
+{
+ int res = 0;
+ uint32_t id;
+
+ av_log(matroska->ctx, AV_LOG_DEBUG, "parsing tracks...\n");
+
+ while (res == 0) {
+ if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
+ res = AVERROR_IO;
+ break;
+ } else if (matroska->level_up) {
+ matroska->level_up--;
+ break;
+ }
+
+ switch (id) {
+ /* one track within the "all-tracks" header */
+ case MATROSKA_ID_TRACKENTRY:
+ res = matroska_add_stream(matroska);
+ break;
+
+ default:
+ av_log(matroska->ctx, AV_LOG_INFO,
+ "Unknown entry 0x%x in track header\n", id);
+ /* fall-through */
+
+ case EBML_ID_VOID:
+ res = ebml_read_skip(matroska);
+ break;
+ }
+
+ if (matroska->level_up) {
+ matroska->level_up--;
+ break;
+ }
+ }
+
+ return res;
+}
+
+static int
+matroska_parse_index (MatroskaDemuxContext *matroska)
+{
+ int res = 0;
+ uint32_t id;
+ MatroskaDemuxIndex idx;
+
+ av_log(matroska->ctx, AV_LOG_DEBUG, "parsing index...\n");
+
+ while (res == 0) {
+ if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
+ res = AVERROR_IO;
+ break;
+ } else if (matroska->level_up) {
+ matroska->level_up--;
+ break;
+ }
+
+ switch (id) {
+ /* one single index entry ('point') */
+ case MATROSKA_ID_POINTENTRY:
+ if ((res = ebml_read_master(matroska, &id)) < 0)
+ break;
+
+ /* in the end, we hope to fill one entry with a
+ * timestamp, a file position and a tracknum */
+ idx.pos = (uint64_t) -1;
+ idx.time = (uint64_t) -1;
+ idx.track = (uint16_t) -1;
+
+ while (res == 0) {
+ if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
+ res = AVERROR_IO;
+ break;
+ } else if (matroska->level_up) {
+ matroska->level_up--;
+ break;
+ }
+
+ switch (id) {
+ /* one single index entry ('point') */
+ case MATROSKA_ID_CUETIME: {
+ uint64_t time;
+ if ((res = ebml_read_uint(matroska, &id,
+ &time)) < 0)
+ break;
+ idx.time = time * matroska->time_scale;
+ break;
+ }
+
+ /* position in the file + track to which it
+ * belongs */
+ case MATROSKA_ID_CUETRACKPOSITION:
+ if ((res = ebml_read_master(matroska, &id)) < 0)
+ break;
+
+ while (res == 0) {
+ if (!(id = ebml_peek_id (matroska,
+ &matroska->level_up))) {
+ res = AVERROR_IO;
+ break;
+ } else if (matroska->level_up) {
+ matroska->level_up--;
+ break;
+ }
+
+ switch (id) {
+ /* track number */
+ case MATROSKA_ID_CUETRACK: {
+ uint64_t num;
+ if ((res = ebml_read_uint(matroska,
+ &id, &num)) < 0)
+ break;
+ idx.track = num;
+ break;
+ }
+
+ /* position in file */
+ case MATROSKA_ID_CUECLUSTERPOSITION: {
+ uint64_t num;
+ if ((res = ebml_read_uint(matroska,
+ &id, &num)) < 0)
+ break;
+ idx.pos = num+matroska->segment_start;
+ break;
+ }
+
+ default:
+ av_log(matroska->ctx, AV_LOG_INFO,
+ "Unknown entry 0x%x in "
+ "CuesTrackPositions\n", id);
+ /* fall-through */
+
+ case EBML_ID_VOID:
+ res = ebml_read_skip(matroska);
+ break;
+ }
+
+ if (matroska->level_up) {
+ matroska->level_up--;
+ break;
+ }
+ }
+
+ break;
+
+ default:
+ av_log(matroska->ctx, AV_LOG_INFO,
+ "Unknown entry 0x%x in cuespoint "
+ "index\n", id);
+ /* fall-through */
+
+ case EBML_ID_VOID:
+ res = ebml_read_skip(matroska);
+ break;
+ }
+
+ if (matroska->level_up) {
+ matroska->level_up--;
+ break;
+ }
+ }
+
+ /* so let's see if we got what we wanted */
+ if (idx.pos != (uint64_t) -1 &&
+ idx.time != (uint64_t) -1 &&
+ idx.track != (uint16_t) -1) {
+ if (matroska->num_indexes % 32 == 0) {
+ /* re-allocate bigger index */
+ matroska->index =
+ av_realloc(matroska->index,
+ (matroska->num_indexes + 32) *
+ sizeof(MatroskaDemuxIndex));
+ }
+ matroska->index[matroska->num_indexes] = idx;
+ matroska->num_indexes++;
+ }
+ break;
+
+ default:
+ av_log(matroska->ctx, AV_LOG_INFO,
+ "Unknown entry 0x%x in cues header\n", id);
+ /* fall-through */
+
+ case EBML_ID_VOID:
+ res = ebml_read_skip(matroska);
+ break;
+ }
+
+ if (matroska->level_up) {
+ matroska->level_up--;
+ break;
+ }
+ }
+
+ return res;
+}
+
+static int
+matroska_parse_metadata (MatroskaDemuxContext *matroska)
+{
+ int res = 0;
+ uint32_t id;
+
+ while (res == 0) {
+ if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
+ res = AVERROR_IO;
+ break;
+ } else if (matroska->level_up) {
+ matroska->level_up--;
+ break;
+ }
+
+ switch (id) {
+ /* Hm, this is unsupported... */
+ default:
+ av_log(matroska->ctx, AV_LOG_INFO,
+ "Unknown entry 0x%x in metadata header\n", id);
+ /* fall-through */
+
+ case EBML_ID_VOID:
+ res = ebml_read_skip(matroska);
+ break;
+ }
+
+ if (matroska->level_up) {
+ matroska->level_up--;
+ break;
+ }
+ }
+
+ return res;
+}
+
+static int
+matroska_parse_seekhead (MatroskaDemuxContext *matroska)
+{
+ int res = 0;
+ uint32_t id;
+
+ av_log(matroska->ctx, AV_LOG_DEBUG, "parsing seekhead...\n");
+
+ while (res == 0) {
+ if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
+ res = AVERROR_IO;
+ break;
+ } else if (matroska->level_up) {
+ matroska->level_up--;
+ break;
+ }
+
+ switch (id) {
+ case MATROSKA_ID_SEEKENTRY: {
+ uint32_t seek_id = 0, peek_id_cache = 0;
+ uint64_t seek_pos = (uint64_t) -1, t;
+
+ if ((res = ebml_read_master(matroska, &id)) < 0)
+ break;
+
+ while (res == 0) {
+ if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
+ res = AVERROR_IO;
+ break;
+ } else if (matroska->level_up) {
+ matroska->level_up--;
+ break;
+ }
+
+ switch (id) {
+ case MATROSKA_ID_SEEKID:
+ res = ebml_read_uint(matroska, &id, &t);
+ seek_id = t;
+ break;
+
+ case MATROSKA_ID_SEEKPOSITION:
+ res = ebml_read_uint(matroska, &id, &seek_pos);
+ break;
+
+ default:
+ av_log(matroska->ctx, AV_LOG_INFO,
+ "Unknown seekhead ID 0x%x\n", id);
+ /* fall-through */
+
+ case EBML_ID_VOID:
+ res = ebml_read_skip(matroska);
+ break;
+ }
+
+ if (matroska->level_up) {
+ matroska->level_up--;
+ break;
+ }
+ }
+
+ if (!seek_id || seek_pos == (uint64_t) -1) {
+ av_log(matroska->ctx, AV_LOG_INFO,
+ "Incomplete seekhead entry (0x%x/%"PRIu64")\n",
+ seek_id, seek_pos);
+ break;
+ }
+
+ switch (seek_id) {
+ case MATROSKA_ID_CUES:
+ case MATROSKA_ID_TAGS: {
+ uint32_t level_up = matroska->level_up;
+ offset_t before_pos;
+ uint64_t length;
+ MatroskaLevel level;
+
+ /* remember the peeked ID and the current position */
+ peek_id_cache = matroska->peek_id;
+ before_pos = url_ftell(&matroska->ctx->pb);
+
+ /* seek */
+ if ((res = ebml_read_seek(matroska, seek_pos +
+ matroska->segment_start)) < 0)
+ return res;
+
+ /* we don't want to lose our seekhead level, so we add
+ * a dummy. This is a crude hack. */
+ if (matroska->num_levels == EBML_MAX_DEPTH) {
+ av_log(matroska->ctx, AV_LOG_INFO,
+ "Max EBML element depth (%d) reached, "
+ "cannot parse further.\n", EBML_MAX_DEPTH);
+ return AVERROR_UNKNOWN;
+ }
+
+ level.start = 0;
+ level.length = (uint64_t)-1;
+ matroska->levels[matroska->num_levels] = level;
+ matroska->num_levels++;
+
+ /* check ID */
+ if (!(id = ebml_peek_id (matroska,
+ &matroska->level_up)))
+ goto finish;
+ if (id != seek_id) {
+ av_log(matroska->ctx, AV_LOG_INFO,
+ "We looked for ID=0x%x but got "
+ "ID=0x%x (pos=%"PRIu64")",
+ seek_id, id, seek_pos +
+ matroska->segment_start);
+ goto finish;
+ }
+
+ /* read master + parse */
+ if ((res = ebml_read_master(matroska, &id)) < 0)
+ goto finish;
+ switch (id) {
+ case MATROSKA_ID_CUES:
+ if (!(res = matroska_parse_index(matroska)) ||
+ url_feof(&matroska->ctx->pb)) {
+ matroska->index_parsed = 1;
+ res = 0;
+ }
+ break;
+ case MATROSKA_ID_TAGS:
+ if (!(res = matroska_parse_metadata(matroska)) ||
+ url_feof(&matroska->ctx->pb)) {
+ matroska->metadata_parsed = 1;
+ res = 0;
+ }
+ break;
+ }
+
+ finish:
+ /* remove dummy level */
+ while (matroska->num_levels) {
+ matroska->num_levels--;
+ length =
+ matroska->levels[matroska->num_levels].length;
+ if (length == (uint64_t)-1)
+ break;
+ }
+
+ /* seek back */
+ if ((res = ebml_read_seek(matroska, before_pos)) < 0)
+ return res;
+ matroska->peek_id = peek_id_cache;
+ matroska->level_up = level_up;
+ break;
+ }
+
+ default:
+ av_log(matroska->ctx, AV_LOG_INFO,
+ "Ignoring seekhead entry for ID=0x%x\n",
+ seek_id);
+ break;
+ }
+
+ break;
+ }
+
+ default:
+ av_log(matroska->ctx, AV_LOG_INFO,
+ "Unknown seekhead ID 0x%x\n", id);
+ /* fall-through */
+
+ case EBML_ID_VOID:
+ res = ebml_read_skip(matroska);
+ break;
+ }
+
+ if (matroska->level_up) {
+ matroska->level_up--;
+ break;
+ }
+ }
+
+ return res;
+}
+
+#define ARRAY_SIZE(x) (sizeof(x)/sizeof(*x))
+
+static int
+matroska_aac_profile (char *codec_id)
+{
+ static const char *aac_profiles[] = {
+ "MAIN", "LC", "SSR"
+ };
+ int profile;
+
+ for (profile=0; profile<ARRAY_SIZE(aac_profiles); profile++)
+ if (strstr(codec_id, aac_profiles[profile]))
+ break;
+ return profile + 1;
+}
+
+static int
+matroska_aac_sri (int samplerate)
+{
+ static const int aac_sample_rates[] = {
+ 96000, 88200, 64000, 48000, 44100, 32000,
+ 24000, 22050, 16000, 12000, 11025, 8000,
+ };
+ int sri;
+
+ for (sri=0; sri<ARRAY_SIZE(aac_sample_rates); sri++)
+ if (aac_sample_rates[sri] == samplerate)
+ break;
+ return sri;
+}
+
+static int
+matroska_read_header (AVFormatContext *s,
+ AVFormatParameters *ap)
+{
+ MatroskaDemuxContext *matroska = s->priv_data;
+ char *doctype;
+ int version, last_level, res = 0;
+ uint32_t id;
+
+ matroska->ctx = s;
+
+ /* First read the EBML header. */
+ doctype = NULL;
+ if ((res = ebml_read_header(matroska, &doctype, &version)) < 0)
+ return res;
+ if ((doctype == NULL) || strcmp(doctype, "matroska")) {
+ av_log(matroska->ctx, AV_LOG_ERROR,
+ "Wrong EBML doctype ('%s' != 'matroska').\n",
+ doctype ? doctype : "(none)");
+ if (doctype)
+ av_free(doctype);
+ return AVERROR_NOFMT;
+ }
+ av_free(doctype);
+ if (version > 2) {
+ av_log(matroska->ctx, AV_LOG_ERROR,
+ "Matroska demuxer version 2 too old for file version %d\n",
+ version);
+ return AVERROR_NOFMT;
+ }
+
+ /* The next thing is a segment. */
+ while (1) {
+ if (!(id = ebml_peek_id(matroska, &last_level)))
+ return AVERROR_IO;
+ if (id == MATROSKA_ID_SEGMENT)
+ break;
+
+ /* oi! */
+ av_log(matroska->ctx, AV_LOG_INFO,
+ "Expected a Segment ID (0x%x), but received 0x%x!\n",
+ MATROSKA_ID_SEGMENT, id);
+ if ((res = ebml_read_skip(matroska)) < 0)
+ return res;
+ }
+
+ /* We now have a Matroska segment.
+ * Seeks are from the beginning of the segment,
+ * after the segment ID/length. */
+ if ((res = ebml_read_master(matroska, &id)) < 0)
+ return res;
+ matroska->segment_start = url_ftell(&s->pb);
+
+ matroska->time_scale = 1000000;
+ /* we've found our segment, start reading the different contents in here */
+ while (res == 0) {
+ if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
+ res = AVERROR_IO;
+ break;
+ } else if (matroska->level_up) {
+ matroska->level_up--;
+ break;
+ }
+
+ switch (id) {
+ /* stream info */
+ case MATROSKA_ID_INFO: {
+ if ((res = ebml_read_master(matroska, &id)) < 0)
+ break;
+ res = matroska_parse_info(matroska);
+ break;
+ }
+
+ /* track info headers */
+ case MATROSKA_ID_TRACKS: {
+ if ((res = ebml_read_master(matroska, &id)) < 0)
+ break;
+ res = matroska_parse_tracks(matroska);
+ break;
+ }
+
+ /* stream index */
+ case MATROSKA_ID_CUES: {
+ if (!matroska->index_parsed) {
+ if ((res = ebml_read_master(matroska, &id)) < 0)
+ break;
+ res = matroska_parse_index(matroska);
+ } else
+ res = ebml_read_skip(matroska);
+ break;
+ }
+
+ /* metadata */
+ case MATROSKA_ID_TAGS: {
+ if (!matroska->metadata_parsed) {
+ if ((res = ebml_read_master(matroska, &id)) < 0)
+ break;
+ res = matroska_parse_metadata(matroska);
+ } else
+ res = ebml_read_skip(matroska);
+ break;
+ }
+
+ /* file index (if seekable, seek to Cues/Tags to parse it) */
+ case MATROSKA_ID_SEEKHEAD: {
+ if ((res = ebml_read_master(matroska, &id)) < 0)
+ break;
+ res = matroska_parse_seekhead(matroska);
+ break;
+ }
+
+ case MATROSKA_ID_CLUSTER: {
+ /* Do not read the master - this will be done in the next
+ * call to matroska_read_packet. */
+ res = 1;
+ break;
+ }
+
+ default:
+ av_log(matroska->ctx, AV_LOG_INFO,
+ "Unknown matroska file header ID 0x%x\n", id);
+ /* fall-through */
+
+ case EBML_ID_VOID:
+ res = ebml_read_skip(matroska);
+ break;
+ }
+
+ if (matroska->level_up) {
+ matroska->level_up--;
+ break;
+ }
+ }
+
+ /* Have we found a cluster? */
+ if (ebml_peek_id(matroska, NULL) == MATROSKA_ID_CLUSTER) {
+ int i, j;
+ MatroskaTrack *track;
+ AVStream *st;
+
+ for (i = 0; i < matroska->num_tracks; i++) {
+ enum CodecID codec_id = CODEC_ID_NONE;
+ uint8_t *extradata = NULL;
+ int extradata_size = 0;
+ int extradata_offset = 0;
+ track = matroska->tracks[i];
+
+ /* libavformat does not really support subtitles.
+ * Also apply some sanity checks. */
+ if ((track->type == MATROSKA_TRACK_TYPE_SUBTITLE) ||
+ (track->codec_id == NULL))
+ continue;
+
+ for(j=0; ff_mkv_codec_tags[j].str; j++){
+ if(!strncmp(ff_mkv_codec_tags[j].str, track->codec_id,
+ strlen(ff_mkv_codec_tags[j].str))){
+ codec_id= ff_mkv_codec_tags[j].id;
+ break;
+ }
+ }
+
+ /* Set the FourCC from the CodecID. */
+ /* This is the MS compatibility mode which stores a
+ * BITMAPINFOHEADER in the CodecPrivate. */
+ if (!strcmp(track->codec_id,
+ MATROSKA_CODEC_ID_VIDEO_VFW_FOURCC) &&
+ (track->codec_priv_size >= 40) &&
+ (track->codec_priv != NULL)) {
+ unsigned char *p;
+
+ /* Offset of biCompression. Stored in LE. */
+ p = (unsigned char *)track->codec_priv + 16;
+ ((MatroskaVideoTrack *)track)->fourcc = (p[3] << 24) |
+ (p[2] << 16) | (p[1] << 8) | p[0];
+ codec_id = codec_get_id(codec_bmp_tags, ((MatroskaVideoTrack *)track)->fourcc);
+
+ }
+
+ /* This is the MS compatibility mode which stores a
+ * WAVEFORMATEX in the CodecPrivate. */
+ else if (!strcmp(track->codec_id,
+ MATROSKA_CODEC_ID_AUDIO_ACM) &&
+ (track->codec_priv_size >= 18) &&
+ (track->codec_priv != NULL)) {
+ unsigned char *p;
+ uint16_t tag;
+
+ /* Offset of wFormatTag. Stored in LE. */
+ p = (unsigned char *)track->codec_priv;
+ tag = (p[1] << 8) | p[0];
+ codec_id = codec_get_id(codec_wav_tags, tag);
+
+ }
+
+ else if (codec_id == CODEC_ID_AAC && !track->codec_priv_size) {
+ MatroskaAudioTrack *audiotrack = (MatroskaAudioTrack *) track;
+ int profile = matroska_aac_profile(track->codec_id);
+ int sri = matroska_aac_sri(audiotrack->internal_samplerate);
+ extradata = av_malloc(5);
+ if (extradata == NULL)
+ return AVERROR_NOMEM;
+ extradata[0] = (profile << 3) | ((sri&0x0E) >> 1);
+ extradata[1] = ((sri&0x01) << 7) | (audiotrack->channels<<3);
+ if (strstr(track->codec_id, "SBR")) {
+ sri = matroska_aac_sri(audiotrack->samplerate);
+ extradata[2] = 0x56;
+ extradata[3] = 0xE5;
+ extradata[4] = 0x80 | (sri<<3);
+ extradata_size = 5;
+ } else {
+ extradata_size = 2;
+ }
+ track->default_duration = 1024*1000 / audiotrack->internal_samplerate;
+ }
+
+ else if (codec_id == CODEC_ID_TTA) {
+ MatroskaAudioTrack *audiotrack = (MatroskaAudioTrack *) track;
+ ByteIOContext b;
+ extradata_size = 30;
+ extradata = av_mallocz(extradata_size);
+ if (extradata == NULL)
+ return AVERROR_NOMEM;
+ init_put_byte(&b, extradata, extradata_size, 1,
+ NULL, NULL, NULL, NULL);
+ put_buffer(&b, (uint8_t *) "TTA1", 4);
+ put_le16(&b, 1);
+ put_le16(&b, audiotrack->channels);
+ put_le16(&b, audiotrack->bitdepth);
+ put_le32(&b, audiotrack->samplerate);
+ put_le32(&b, matroska->ctx->duration * audiotrack->samplerate);
+ }
+
+ else if (codec_id == CODEC_ID_RV10 || codec_id == CODEC_ID_RV20 ||
+ codec_id == CODEC_ID_RV30 || codec_id == CODEC_ID_RV40) {
+ extradata_offset = 26;
+ track->codec_priv_size -= extradata_offset;
+ track->flags |= MATROSKA_TRACK_REAL_V;
+ }
+
+ if (codec_id == CODEC_ID_NONE) {
+ av_log(matroska->ctx, AV_LOG_INFO,
+ "Unknown/unsupported CodecID %s.\n",
+ track->codec_id);
+ }
+
+ track->stream_index = matroska->num_streams;
+
+ matroska->num_streams++;
+ st = av_new_stream(s, track->stream_index);
+ if (st == NULL)
+ return AVERROR_NOMEM;
+ av_set_pts_info(st, 64, matroska->time_scale, 1000*1000*1000); /* 64 bit pts in ns */
+
+ st->codec->codec_id = codec_id;
+ st->start_time = 0;
+
+ if (track->default_duration)
+ av_reduce(&st->codec->time_base.num, &st->codec->time_base.den,
+ track->default_duration, 1000, 30000);
+
+ if(extradata){
+ st->codec->extradata = extradata;
+ st->codec->extradata_size = extradata_size;
+ } else if(track->codec_priv && track->codec_priv_size > 0){
+ st->codec->extradata = av_malloc(track->codec_priv_size);
+ if(st->codec->extradata == NULL)
+ return AVERROR_NOMEM;
+ st->codec->extradata_size = track->codec_priv_size;
+ memcpy(st->codec->extradata,track->codec_priv+extradata_offset,
+ track->codec_priv_size);
+ }
+
+ if (track->type == MATROSKA_TRACK_TYPE_VIDEO) {
+ MatroskaVideoTrack *videotrack = (MatroskaVideoTrack *)track;
+
+ st->codec->codec_type = CODEC_TYPE_VIDEO;
+ st->codec->codec_tag = videotrack->fourcc;
+ st->codec->width = videotrack->pixel_width;
+ st->codec->height = videotrack->pixel_height;
+ if (videotrack->display_width == 0)
+ videotrack->display_width= videotrack->pixel_width;
+ if (videotrack->display_height == 0)
+ videotrack->display_height= videotrack->pixel_height;
+ av_reduce(&st->codec->sample_aspect_ratio.num,
+ &st->codec->sample_aspect_ratio.den,
+ st->codec->height * videotrack->display_width,
+ st->codec-> width * videotrack->display_height,
+ 255);
+ st->need_parsing = AVSTREAM_PARSE_HEADERS;
+ } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
+ MatroskaAudioTrack *audiotrack = (MatroskaAudioTrack *)track;
+
+ st->codec->codec_type = CODEC_TYPE_AUDIO;
+ st->codec->sample_rate = audiotrack->samplerate;
+ st->codec->channels = audiotrack->channels;
+ } else if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE) {
+ st->codec->codec_type = CODEC_TYPE_SUBTITLE;
+ }
+
+ /* What do we do with private data? E.g. for Vorbis. */
+ }
+ res = 0;
+ }
+
+ if (matroska->index_parsed) {
+ int i, track, stream;
+ for (i=0; i<matroska->num_indexes; i++) {
+ MatroskaDemuxIndex *idx = &matroska->index[i];
+ track = matroska_find_track_by_num(matroska, idx->track);
+ stream = matroska->tracks[track]->stream_index;
+ av_add_index_entry(matroska->ctx->streams[stream],
+ idx->pos, idx->time/matroska->time_scale,
+ 0, 0, AVINDEX_KEYFRAME);
+ }
+ }
+
+ return res;
+}
+
+static inline int
+rv_offset(uint8_t *data, int slice, int slices)
+{
+ return AV_RL32(data+8*slice+4) + 8*slices;
+}
+
+static int
+matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data, int size,
+ int64_t pos, uint64_t cluster_time, uint64_t duration,
+ int is_keyframe, int is_bframe)
+{
+ int res = 0;
+ int track;
+ AVStream *st;
+ AVPacket *pkt;
+ uint8_t *origdata = data;
+ int16_t block_time;
+ uint32_t *lace_size = NULL;
+ int n, flags, laces = 0;
+ uint64_t num;
+
+ /* first byte(s): tracknum */
+ if ((n = matroska_ebmlnum_uint(data, size, &num)) < 0) {
+ av_log(matroska->ctx, AV_LOG_ERROR, "EBML block data error\n");
+ av_free(origdata);
+ return res;
+ }
+ data += n;
+ size -= n;
+
+ /* fetch track from num */
+ track = matroska_find_track_by_num(matroska, num);
+ if (size <= 3 || track < 0 || track >= matroska->num_tracks) {
+ av_log(matroska->ctx, AV_LOG_INFO,
+ "Invalid stream %d or size %u\n", track, size);
+ av_free(origdata);
+ return res;
+ }
+ st = matroska->ctx->streams[matroska->tracks[track]->stream_index];
+ if (st->discard >= AVDISCARD_ALL) {
+ av_free(origdata);
+ return res;
+ }
+ if (duration == AV_NOPTS_VALUE)
+ duration = matroska->tracks[track]->default_duration;
+
+ /* block_time (relative to cluster time) */
+ block_time = (data[0] << 8) | data[1];
+ data += 2;
+ size -= 2;
+ flags = *data;
+ data += 1;
+ size -= 1;
+ if (is_keyframe == -1)
+ is_keyframe = flags & 1 ? PKT_FLAG_KEY : 0;
+
+ if (matroska->skip_to_keyframe) {
+ if (!is_keyframe || st != matroska->skip_to_stream)
+ return res;
+ matroska->skip_to_keyframe = 0;
+ }
+
+ switch ((flags & 0x06) >> 1) {
+ case 0x0: /* no lacing */
+ laces = 1;
+ lace_size = av_mallocz(sizeof(int));
+ lace_size[0] = size;
+ break;
+
+ case 0x1: /* xiph lacing */
+ case 0x2: /* fixed-size lacing */
+ case 0x3: /* EBML lacing */
+ if (size == 0) {
+ res = -1;
+ break;
+ }
+ laces = (*data) + 1;
+ data += 1;
+ size -= 1;
+ lace_size = av_mallocz(laces * sizeof(int));
+
+ switch ((flags & 0x06) >> 1) {
+ case 0x1: /* xiph lacing */ {
+ uint8_t temp;
+ uint32_t total = 0;
+ for (n = 0; res == 0 && n < laces - 1; n++) {
+ while (1) {
+ if (size == 0) {
+ res = -1;
+ break;
+ }
+ temp = *data;
+ lace_size[n] += temp;
+ data += 1;
+ size -= 1;
+ if (temp != 0xff)
+ break;
+ }
+ total += lace_size[n];
+ }
+ lace_size[n] = size - total;
+ break;
+ }
+
+ case 0x2: /* fixed-size lacing */
+ for (n = 0; n < laces; n++)
+ lace_size[n] = size / laces;
+ break;
+
+ case 0x3: /* EBML lacing */ {
+ uint32_t total;
+ n = matroska_ebmlnum_uint(data, size, &num);
+ if (n < 0) {
+ av_log(matroska->ctx, AV_LOG_INFO,
+ "EBML block data error\n");
+ break;
+ }
+ data += n;
+ size -= n;
+ total = lace_size[0] = num;
+ for (n = 1; res == 0 && n < laces - 1; n++) {
+ int64_t snum;
+ int r;
+ r = matroska_ebmlnum_sint (data, size, &snum);
+ if (r < 0) {
+ av_log(matroska->ctx, AV_LOG_INFO,
+ "EBML block data error\n");
+ break;
+ }
+ data += r;
+ size -= r;
+ lace_size[n] = lace_size[n - 1] + snum;
+ total += lace_size[n];
+ }
+ lace_size[n] = size - total;
+ break;
+ }
+ }
+ break;
+ }
+
+ if (res == 0) {
+ int real_v = matroska->tracks[track]->flags & MATROSKA_TRACK_REAL_V;
+ uint64_t timecode = AV_NOPTS_VALUE;
+
+ if (cluster_time != (uint64_t)-1 && cluster_time + block_time >= 0)
+ timecode = cluster_time + block_time;
+
+ for (n = 0; n < laces; n++) {
+ int slice, slices = 1;
+
+ if (real_v) {
+ slices = *data++ + 1;
+ lace_size[n]--;
+ }
+
+ for (slice=0; slice<slices; slice++) {
+ int slice_size, slice_offset = 0;
+ if (real_v)
+ slice_offset = rv_offset(data, slice, slices);
+ if (slice+1 == slices)
+ slice_size = lace_size[n] - slice_offset;
+ else
+ slice_size = rv_offset(data, slice+1, slices) - slice_offset;
+ pkt = av_mallocz(sizeof(AVPacket));
+ /* XXX: prevent data copy... */
+ if (av_new_packet(pkt, slice_size) < 0) {
+ res = AVERROR_NOMEM;
+ n = laces-1;
+ break;
+ }
+ memcpy (pkt->data, data+slice_offset, slice_size);
+
+ if (n == 0)
+ pkt->flags = is_keyframe;
+ pkt->stream_index = matroska->tracks[track]->stream_index;
+
+ pkt->pts = timecode;
+ pkt->pos = pos;
+ pkt->duration = duration;
+
+ matroska_queue_packet(matroska, pkt);
+
+ if (timecode != AV_NOPTS_VALUE)
+ timecode = duration ? timecode + duration : AV_NOPTS_VALUE;
+ }
+ data += lace_size[n];
+ }
+ }
+
+ av_free(lace_size);
+ av_free(origdata);
+ return res;
+}
+
+static int
+matroska_parse_blockgroup (MatroskaDemuxContext *matroska,
+ uint64_t cluster_time)
+{
+ int res = 0;
+ uint32_t id;
+ int is_bframe = 0;
+ int is_keyframe = PKT_FLAG_KEY, last_num_packets = matroska->num_packets;
+ uint64_t duration = AV_NOPTS_VALUE;
+ uint8_t *data;
+ int size = 0;
+ int64_t pos = 0;
+
+ av_log(matroska->ctx, AV_LOG_DEBUG, "parsing blockgroup...\n");
+
+ while (res == 0) {
+ if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
+ res = AVERROR_IO;
+ break;
+ } else if (matroska->level_up) {
+ matroska->level_up--;
+ break;
+ }
+
+ switch (id) {
+ /* one block inside the group. Note, block parsing is one
+ * of the harder things, so this code is a bit complicated.
+ * See http://www.matroska.org/ for documentation. */
+ case MATROSKA_ID_BLOCK: {
+ pos = url_ftell(&matroska->ctx->pb);
+ res = ebml_read_binary(matroska, &id, &data, &size);
+ break;
+ }
+
+ case MATROSKA_ID_BLOCKDURATION: {
+ if ((res = ebml_read_uint(matroska, &id, &duration)) < 0)
+ break;
+ duration /= matroska->time_scale;
+ break;
+ }
+
+ case MATROSKA_ID_BLOCKREFERENCE: {
+ int64_t num;
+ /* We've found a reference, so not even the first frame in
+ * the lace is a key frame. */
+ is_keyframe = 0;
+ if (last_num_packets != matroska->num_packets)
+ matroska->packets[last_num_packets]->flags = 0;
+ if ((res = ebml_read_sint(matroska, &id, &num)) < 0)
+ break;
+ if (num > 0)
+ is_bframe = 1;
+ break;
+ }
+
+ default:
+ av_log(matroska->ctx, AV_LOG_INFO,
+ "Unknown entry 0x%x in blockgroup data\n", id);
+ /* fall-through */
+
+ case EBML_ID_VOID:
+ res = ebml_read_skip(matroska);
+ break;
+ }
+
+ if (matroska->level_up) {
+ matroska->level_up--;
+ break;
+ }
+ }
+
+ if (res)
+ return res;
+
+ if (size > 0)
+ res = matroska_parse_block(matroska, data, size, pos, cluster_time,
+ duration, is_keyframe, is_bframe);
+
+ return res;
+}
+
+static int
+matroska_parse_cluster (MatroskaDemuxContext *matroska)
+{
+ int res = 0;
+ uint32_t id;
+ uint64_t cluster_time = 0;
+ uint8_t *data;
+ int64_t pos;
+ int size;
+
+ av_log(matroska->ctx, AV_LOG_DEBUG,
+ "parsing cluster at %"PRId64"\n", url_ftell(&matroska->ctx->pb));
+
+ while (res == 0) {
+ if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
+ res = AVERROR_IO;
+ break;
+ } else if (matroska->level_up) {
+ matroska->level_up--;
+ break;
+ }
+
+ switch (id) {
+ /* cluster timecode */
+ case MATROSKA_ID_CLUSTERTIMECODE: {
+ uint64_t num;
+ if ((res = ebml_read_uint(matroska, &id, &num)) < 0)
+ break;
+ cluster_time = num;
+ break;
+ }
+
+ /* a group of blocks inside a cluster */
+ case MATROSKA_ID_BLOCKGROUP:
+ if ((res = ebml_read_master(matroska, &id)) < 0)
+ break;
+ res = matroska_parse_blockgroup(matroska, cluster_time);
+ break;
+
+ case MATROSKA_ID_SIMPLEBLOCK:
+ pos = url_ftell(&matroska->ctx->pb);
+ res = ebml_read_binary(matroska, &id, &data, &size);
+ if (res == 0)
+ res = matroska_parse_block(matroska, data, size, pos,
+ cluster_time, AV_NOPTS_VALUE,
+ -1, 0);
+ break;
+
+ default:
+ av_log(matroska->ctx, AV_LOG_INFO,
+ "Unknown entry 0x%x in cluster data\n", id);
+ /* fall-through */
+
+ case EBML_ID_VOID:
+ res = ebml_read_skip(matroska);
+ break;
+ }
+
+ if (matroska->level_up) {
+ matroska->level_up--;
+ break;
+ }
+ }
+
+ return res;
+}
+
+static int
+matroska_read_packet (AVFormatContext *s,
+ AVPacket *pkt)
+{
+ MatroskaDemuxContext *matroska = s->priv_data;
+ int res = 0;
+ uint32_t id;
+
+ /* Read stream until we have a packet queued. */
+ while (matroska_deliver_packet(matroska, pkt)) {
+
+ /* Have we already reached the end? */
+ if (matroska->done)
+ return AVERROR_IO;
+
+ while (res == 0) {
+ if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
+ return AVERROR_IO;
+ } else if (matroska->level_up) {
+ matroska->level_up--;
+ break;
+ }
+
+ switch (id) {
+ case MATROSKA_ID_CLUSTER:
+ if ((res = ebml_read_master(matroska, &id)) < 0)
+ break;
+ if ((res = matroska_parse_cluster(matroska)) == 0)
+ res = 1; /* Parsed one cluster, let's get out. */
+ break;
+
+ default:
+ case EBML_ID_VOID:
+ res = ebml_read_skip(matroska);
+ break;
+ }
+
+ if (matroska->level_up) {
+ matroska->level_up--;
+ break;
+ }
+ }
+
+ if (res == -1)
+ matroska->done = 1;
+ }
+
+ return 0;
+}
+
+static int
+matroska_read_seek (AVFormatContext *s, int stream_index, int64_t timestamp,
+ int flags)
+{
+ MatroskaDemuxContext *matroska = s->priv_data;
+ AVStream *st = s->streams[stream_index];
+ int index;
+
+ /* find index entry */
+ index = av_index_search_timestamp(st, timestamp, flags);
+ if (index < 0)
+ return 0;
+
+ /* do the seek */
+ url_fseek(&s->pb, st->index_entries[index].pos, SEEK_SET);
+ matroska->skip_to_keyframe = !(flags & AVSEEK_FLAG_ANY);
+ matroska->skip_to_stream = st;
+ matroska->num_packets = 0;
+ matroska->peek_id = 0;
+ return 0;
+}
+
+static int
+matroska_read_close (AVFormatContext *s)
+{
+ MatroskaDemuxContext *matroska = s->priv_data;
+ int n = 0;
+
+ av_free(matroska->writing_app);
+ av_free(matroska->muxing_app);
+ av_free(matroska->index);
+
+ if (matroska->packets != NULL) {
+ for (n = 0; n < matroska->num_packets; n++) {
+ av_free_packet(matroska->packets[n]);
+ av_free(matroska->packets[n]);
+ }
+ av_free(matroska->packets);
+ }
+
+ for (n = 0; n < matroska->num_tracks; n++) {
+ MatroskaTrack *track = matroska->tracks[n];
+ av_free(track->codec_id);
+ av_free(track->codec_name);
+ av_free(track->codec_priv);
+ av_free(track->name);
+ av_free(track->language);
+
+ av_free(track);
+ }
+
+ return 0;
+}
+
+AVInputFormat matroska_demuxer = {
+ "matroska",
+ "Matroska file format",
+ sizeof(MatroskaDemuxContext),
+ matroska_probe,
+ matroska_read_header,
+ matroska_read_packet,
+ matroska_read_close,
+ matroska_read_seek,
+};
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-26 11:03:44 +0000