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authorKostya Shishkov <kostya.shishkov@gmail.com>2007-09-13 03:22:47 +0000
committerKostya Shishkov <kostya.shishkov@gmail.com>2007-09-13 03:22:47 +0000
commitbf4a1f17ee9237b6efd4250cf894e274afc31a5f (patch)
tree0c0e605b516d2e9bb64181daa2ec0819d078eb34 /libavformat/ape.c
parent48fe9238a0aec437aa9ab9a8912191d163feb519 (diff)
Monkey Audio decoder
Originally committed as revision 10484 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavformat/ape.c')
-rw-r--r--libavformat/ape.c392
1 files changed, 392 insertions, 0 deletions
diff --git a/libavformat/ape.c b/libavformat/ape.c
new file mode 100644
index 0000000000..336871484e
--- /dev/null
+++ b/libavformat/ape.c
@@ -0,0 +1,392 @@
+/*
+ * Monkey's Audio APE demuxer
+ * Copyright (c) 2007 Benjamin Zores <ben@geexbox.org>
+ * based upon libdemac from Dave Chapman.
+ *
+ * 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
+ */
+
+#include <stdio.h>
+
+#include "avformat.h"
+
+/* The earliest and latest file formats supported by this library */
+#define APE_MIN_VERSION 3970
+#define APE_MAX_VERSION 3990
+
+#define MAC_FORMAT_FLAG_8_BIT 1 // is 8-bit [OBSOLETE]
+#define MAC_FORMAT_FLAG_CRC 2 // uses the new CRC32 error detection [OBSOLETE]
+#define MAC_FORMAT_FLAG_HAS_PEAK_LEVEL 4 // uint32 nPeakLevel after the header [OBSOLETE]
+#define MAC_FORMAT_FLAG_24_BIT 8 // is 24-bit [OBSOLETE]
+#define MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS 16 // has the number of seek elements after the peak level
+#define MAC_FORMAT_FLAG_CREATE_WAV_HEADER 32 // create the wave header on decompression (not stored)
+
+#define MAC_SUBFRAME_SIZE 4608
+
+#define APE_EXTRADATA_SIZE 6
+
+typedef struct {
+ int64_t pos;
+ int nblocks;
+ int size;
+ int skip;
+ int64_t pts;
+} APEFrame;
+
+typedef struct {
+ /* Derived fields */
+ uint32_t junklength;
+ uint32_t firstframe;
+ uint32_t totalsamples;
+ int currentframe;
+ APEFrame *frames;
+
+ /* Info from Descriptor Block */
+ char magic[4];
+ int16_t fileversion;
+ int16_t padding1;
+ uint32_t descriptorlength;
+ uint32_t headerlength;
+ uint32_t seektablelength;
+ uint32_t wavheaderlength;
+ uint32_t audiodatalength;
+ uint32_t audiodatalength_high;
+ uint32_t wavtaillength;
+ uint8_t md5[16];
+
+ /* Info from Header Block */
+ uint16_t compressiontype;
+ uint16_t formatflags;
+ uint32_t blocksperframe;
+ uint32_t finalframeblocks;
+ uint32_t totalframes;
+ uint16_t bps;
+ uint16_t channels;
+ uint32_t samplerate;
+
+ /* Seektable */
+ uint32_t *seektable;
+} APEContext;
+
+static int ape_probe(AVProbeData * p)
+{
+ if (p->buf[0] == 'M' && p->buf[1] == 'A' && p->buf[2] == 'C' && p->buf[3] == ' ')
+ return AVPROBE_SCORE_MAX;
+
+ return 0;
+}
+
+static void ape_dumpinfo(APEContext * ape_ctx)
+{
+ int i;
+
+ av_log(NULL, AV_LOG_DEBUG, "Descriptor Block:\n\n");
+ av_log(NULL, AV_LOG_DEBUG, "magic = \"%c%c%c%c\"\n", ape_ctx->magic[0], ape_ctx->magic[1], ape_ctx->magic[2], ape_ctx->magic[3]);
+ av_log(NULL, AV_LOG_DEBUG, "fileversion = %d\n", ape_ctx->fileversion);
+ av_log(NULL, AV_LOG_DEBUG, "descriptorlength = %d\n", ape_ctx->descriptorlength);
+ av_log(NULL, AV_LOG_DEBUG, "headerlength = %d\n", ape_ctx->headerlength);
+ av_log(NULL, AV_LOG_DEBUG, "seektablelength = %d\n", ape_ctx->seektablelength);
+ av_log(NULL, AV_LOG_DEBUG, "wavheaderlength = %d\n", ape_ctx->wavheaderlength);
+ av_log(NULL, AV_LOG_DEBUG, "audiodatalength = %d\n", ape_ctx->audiodatalength);
+ av_log(NULL, AV_LOG_DEBUG, "audiodatalength_high = %d\n", ape_ctx->audiodatalength_high);
+ av_log(NULL, AV_LOG_DEBUG, "wavtaillength = %d\n", ape_ctx->wavtaillength);
+ av_log(NULL, AV_LOG_DEBUG, "md5 = ");
+ for (i = 0; i < 16; i++)
+ av_log(NULL, AV_LOG_DEBUG, "%02x", ape_ctx->md5[i]);
+ av_log(NULL, AV_LOG_DEBUG, "\n");
+
+ av_log(NULL, AV_LOG_DEBUG, "\nHeader Block:\n\n");
+
+ av_log(NULL, AV_LOG_DEBUG, "compressiontype = %d\n", ape_ctx->compressiontype);
+ av_log(NULL, AV_LOG_DEBUG, "formatflags = %d\n", ape_ctx->formatflags);
+ av_log(NULL, AV_LOG_DEBUG, "blocksperframe = %d\n", ape_ctx->blocksperframe);
+ av_log(NULL, AV_LOG_DEBUG, "finalframeblocks = %d\n", ape_ctx->finalframeblocks);
+ av_log(NULL, AV_LOG_DEBUG, "totalframes = %d\n", ape_ctx->totalframes);
+ av_log(NULL, AV_LOG_DEBUG, "bps = %d\n", ape_ctx->bps);
+ av_log(NULL, AV_LOG_DEBUG, "channels = %d\n", ape_ctx->channels);
+ av_log(NULL, AV_LOG_DEBUG, "samplerate = %d\n", ape_ctx->samplerate);
+
+ av_log(NULL, AV_LOG_DEBUG, "\nSeektable\n\n");
+ if ((ape_ctx->seektablelength / sizeof(uint32_t)) != ape_ctx->totalframes) {
+ av_log(NULL, AV_LOG_DEBUG, "No seektable\n");
+ } else {
+ for (i = 0; i < ape_ctx->seektablelength / sizeof(uint32_t); i++) {
+ if (i < ape_ctx->totalframes - 1) {
+ av_log(NULL, AV_LOG_DEBUG, "%8d %d (%d bytes)\n", i, ape_ctx->seektable[i], ape_ctx->seektable[i + 1] - ape_ctx->seektable[i]);
+ } else {
+ av_log(NULL, AV_LOG_DEBUG, "%8d %d\n", i, ape_ctx->seektable[i]);
+ }
+ }
+ }
+
+ av_log(NULL, AV_LOG_DEBUG, "\nFrames\n\n");
+ for (i = 0; i < ape_ctx->totalframes; i++)
+ av_log(NULL, AV_LOG_DEBUG, "%8d %8lld %8d (%d samples)\n", i, ape_ctx->frames[i].pos, ape_ctx->frames[i].size, ape_ctx->frames[i].nblocks);
+
+ av_log(NULL, AV_LOG_DEBUG, "\nCalculated information:\n\n");
+ av_log(NULL, AV_LOG_DEBUG, "junklength = %d\n", ape_ctx->junklength);
+ av_log(NULL, AV_LOG_DEBUG, "firstframe = %d\n", ape_ctx->firstframe);
+ av_log(NULL, AV_LOG_DEBUG, "totalsamples = %d\n", ape_ctx->totalsamples);
+}
+
+static int ape_read_header(AVFormatContext * s, AVFormatParameters * ap)
+{
+ ByteIOContext *pb = &s->pb;
+ APEContext *ape = s->priv_data;
+ AVStream *st;
+ uint32_t tag;
+ int i;
+ int total_blocks;
+ int64_t pts;
+
+ /* TODO: Skip any leading junk such as id3v2 tags */
+ ape->junklength = 0;
+
+ tag = get_le32(pb);
+ if (tag != MKTAG('M', 'A', 'C', ' '))
+ return -1;
+
+ ape->fileversion = get_le16(pb);
+
+ if (ape->fileversion < APE_MIN_VERSION || ape->fileversion > APE_MAX_VERSION) {
+ av_log(s, AV_LOG_ERROR, "Unsupported file version - %d.%02d\n", ape->fileversion / 1000, (ape->fileversion % 1000) / 10);
+ return -1;
+ }
+
+ if (ape->fileversion >= 3980) {
+ ape->padding1 = get_le16(pb);
+ ape->descriptorlength = get_le32(pb);
+ ape->headerlength = get_le32(pb);
+ ape->seektablelength = get_le32(pb);
+ ape->wavheaderlength = get_le32(pb);
+ ape->audiodatalength = get_le32(pb);
+ ape->audiodatalength_high = get_le32(pb);
+ ape->wavtaillength = get_le32(pb);
+ get_buffer(pb, ape->md5, 16);
+
+ /* Skip any unknown bytes at the end of the descriptor.
+ This is for future compatibility */
+ if (ape->descriptorlength > 52)
+ url_fseek(pb, ape->descriptorlength - 52, SEEK_CUR);
+
+ /* Read header data */
+ ape->compressiontype = get_le16(pb);
+ ape->formatflags = get_le16(pb);
+ ape->blocksperframe = get_le32(pb);
+ ape->finalframeblocks = get_le32(pb);
+ ape->totalframes = get_le32(pb);
+ ape->bps = get_le16(pb);
+ ape->channels = get_le16(pb);
+ ape->samplerate = get_le32(pb);
+ } else {
+ ape->descriptorlength = 0;
+ ape->headerlength = 32;
+
+ ape->compressiontype = get_le16(pb);
+ ape->formatflags = get_le16(pb);
+ ape->channels = get_le16(pb);
+ ape->samplerate = get_le32(pb);
+ ape->wavheaderlength = get_le32(pb);
+ ape->wavtaillength = get_le32(pb);
+ ape->totalframes = get_le32(pb);
+ ape->finalframeblocks = get_le32(pb);
+
+ if (ape->formatflags & MAC_FORMAT_FLAG_HAS_PEAK_LEVEL) {
+ url_fseek(pb, 4, SEEK_CUR); /* Skip the peak level */
+ ape->headerlength += 4;
+ }
+
+ if (ape->formatflags & MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS) {
+ ape->seektablelength = get_le32(pb);
+ ape->headerlength += 4;
+ ape->seektablelength *= sizeof(int32_t);
+ } else
+ ape->seektablelength = ape->totalframes * sizeof(int32_t);
+
+ if (ape->formatflags & MAC_FORMAT_FLAG_8_BIT)
+ ape->bps = 8;
+ else if (ape->formatflags & MAC_FORMAT_FLAG_24_BIT)
+ ape->bps = 24;
+ else
+ ape->bps = 16;
+
+ if (ape->fileversion >= 3950)
+ ape->blocksperframe = 73728 * 4;
+ else if (ape->fileversion >= 3900 || (ape->fileversion >= 3800 && ape->compressiontype >= 4000))
+ ape->blocksperframe = 73728;
+ else
+ ape->blocksperframe = 9216;
+
+ /* Skip any stored wav header */
+ if (!(ape->formatflags & MAC_FORMAT_FLAG_CREATE_WAV_HEADER))
+ url_fskip(pb, ape->wavheaderlength);
+ }
+
+ if(ape->totalframes > UINT_MAX / sizeof(APEFrame)){
+ av_log(s, AV_LOG_ERROR, "Too many frames: %d\n", ape->totalframes);
+ return -1;
+ }
+ ape->frames = av_malloc(ape->totalframes * sizeof(APEFrame));
+ if(!ape->frames)
+ return AVERROR_NOMEM;
+ ape->firstframe = ape->junklength + ape->descriptorlength + ape->headerlength + ape->seektablelength + ape->wavheaderlength;
+ ape->currentframe = 0;
+
+
+ ape->totalsamples = ape->finalframeblocks;
+ if (ape->totalframes > 1)
+ ape->totalsamples += ape->blocksperframe * (ape->totalframes - 1);
+
+ if (ape->seektablelength > 0) {
+ ape->seektable = av_malloc(ape->seektablelength);
+ for (i = 0; i < ape->seektablelength / sizeof(uint32_t); i++)
+ ape->seektable[i] = get_le32(pb);
+ }
+
+ ape->frames[0].pos = ape->firstframe;
+ ape->frames[0].nblocks = ape->blocksperframe;
+ ape->frames[0].skip = 0;
+ for (i = 1; i < ape->totalframes; i++) {
+ ape->frames[i].pos = ape->seektable[i]; //ape->frames[i-1].pos + ape->blocksperframe;
+ ape->frames[i].nblocks = ape->blocksperframe;
+ ape->frames[i - 1].size = ape->frames[i].pos - ape->frames[i - 1].pos;
+ ape->frames[i].skip = (ape->frames[i].pos - ape->frames[0].pos) & 3;
+ }
+ ape->frames[ape->totalframes - 1].size = ape->finalframeblocks * 4;
+ ape->frames[ape->totalframes - 1].nblocks = ape->finalframeblocks;
+
+ for (i = 0; i < ape->totalframes; i++) {
+ if(ape->frames[i].skip){
+ ape->frames[i].pos -= ape->frames[i].skip;
+ ape->frames[i].size += ape->frames[i].skip;
+ }
+ ape->frames[i].size = (ape->frames[i].size + 3) & ~3;
+ }
+
+
+ ape_dumpinfo(ape);
+
+ av_log(s, AV_LOG_DEBUG, "Decoding file - v%d.%02d, compression level %d\n", ape->fileversion / 1000, (ape->fileversion % 1000) / 10, ape->compressiontype);
+
+ /* now we are ready: build format streams */
+ st = av_new_stream(s, 0);
+ if (!st)
+ return -1;
+
+ total_blocks = (ape->totalframes == 0) ? 0 : ((ape->totalframes - 1) * ape->blocksperframe) + ape->finalframeblocks;
+
+ st->codec->codec_type = CODEC_TYPE_AUDIO;
+ st->codec->codec_id = CODEC_ID_APE;
+ st->codec->codec_tag = MKTAG('A', 'P', 'E', ' ');
+ st->codec->channels = ape->channels;
+ st->codec->sample_rate = ape->samplerate;
+ st->codec->bits_per_sample = ape->bps;
+ st->codec->frame_size = MAC_SUBFRAME_SIZE;
+
+ st->nb_frames = ape->totalframes;
+ s->start_time = 0;
+ s->duration = (int64_t) total_blocks * AV_TIME_BASE / ape->samplerate;
+ av_set_pts_info(st, 64, MAC_SUBFRAME_SIZE, ape->samplerate);
+
+ st->codec->extradata = av_malloc(APE_EXTRADATA_SIZE);
+ st->codec->extradata_size = APE_EXTRADATA_SIZE;
+ AV_WL16(st->codec->extradata + 0, ape->fileversion);
+ AV_WL16(st->codec->extradata + 2, ape->compressiontype);
+ AV_WL16(st->codec->extradata + 4, ape->formatflags);
+
+ pts = 0;
+ for (i = 0; i < ape->totalframes; i++) {
+ ape->frames[i].pts = pts;
+ av_add_index_entry(st, ape->frames[i].pos, ape->frames[i].pts, 0, 0, AVINDEX_KEYFRAME);
+ pts += ape->blocksperframe / MAC_SUBFRAME_SIZE;
+ }
+
+ return 0;
+}
+
+static int ape_read_packet(AVFormatContext * s, AVPacket * pkt)
+{
+ int ret;
+ int nblocks;
+ APEContext *ape = s->priv_data;
+ uint32_t extra_size = 8;
+
+ if (url_feof(&s->pb))
+ return AVERROR_IO;
+ if (ape->currentframe > ape->totalframes)
+ return AVERROR_IO;
+
+ url_fseek (&s->pb, ape->frames[ape->currentframe].pos, SEEK_SET);
+
+ /* Calculate how many blocks there are in this frame */
+ if (ape->currentframe == (ape->totalframes - 1))
+ nblocks = ape->finalframeblocks;
+ else
+ nblocks = ape->blocksperframe;
+
+ if (av_new_packet(pkt, ape->frames[ape->currentframe].size + extra_size) < 0)
+ return AVERROR_NOMEM;
+
+ AV_WL32(pkt->data , nblocks);
+ AV_WL32(pkt->data + 4, ape->frames[ape->currentframe].skip);
+ ret = get_buffer(&s->pb, pkt->data + extra_size, ape->frames[ape->currentframe].size);
+
+ pkt->pts = ape->frames[ape->currentframe].pts;
+ pkt->stream_index = 0;
+
+ /* note: we need to modify the packet size here to handle the last
+ packet */
+ pkt->size = ret + extra_size;
+
+ ape->currentframe++;
+
+ return 0;
+}
+
+static int ape_read_close(AVFormatContext * s)
+{
+ APEContext *ape = s->priv_data;
+
+ av_freep(&ape->frames);
+ av_freep(&ape->seektable);
+ return 0;
+}
+
+static int ape_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
+{
+ AVStream *st = s->streams[stream_index];
+ APEContext *ape = s->priv_data;
+ int index = av_index_search_timestamp(st, timestamp, flags);
+
+ if (index < 0)
+ return -1;
+
+ ape->currentframe = index;
+ return 0;
+}
+
+AVInputFormat ape_demuxer = {
+ "ape",
+ "Monkey's Audio",
+ sizeof(APEContext),
+ ape_probe,
+ ape_read_header,
+ ape_read_packet,
+ ape_read_close,
+ ape_read_seek,
+ .extensions = "ape,apl,mac"
+};