Silicon Graphics Movie demuxer

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>

1 files changed, 468 insertions, 0 deletions

diff --git a/libavformat/mvdec.c b/libavformat/mvdec.c
new file mode 100644
index 0000000000..e21ec06b74
--- /dev/null
+++ b/libavformat/mvdec.c
@@ -0,0 +1,468 @@
+/*
+ * Silicon Graphics Movie demuxer
+ * Copyright (c) 2012 Peter Ross
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * Silicon Graphics Movie demuxer
+ */
+
+#include "libavutil/channel_layout.h"
+#include "libavutil/eval.h"
+#include "libavutil/intreadwrite.h"
+#include "libavutil/rational.h"
+
+#include "avformat.h"
+#include "internal.h"
+
+typedef struct MvContext {
+    int nb_video_tracks;
+    int nb_audio_tracks;
+
+    int eof_count;        ///< number of streams that have finished
+    int stream_index;     ///< current stream index
+    int frame[2];         ///< frame nb for current stream
+
+    int acompression;     ///< compression level for audio stream
+    int aformat;          ///< audio format
+} MvContext;
+
+#define AUDIO_FORMAT_SIGNED 401
+
+static int mv_probe(AVProbeData *p)
+{
+    if (AV_RB32(p->buf) == MKBETAG('M', 'O', 'V', 'I') &&
+        AV_RB16(p->buf + 4) < 3)
+        return AVPROBE_SCORE_MAX;
+    return 0;
+}
+
+static char *var_read_string(AVIOContext *pb, int size)
+{
+    int n;
+    char *str = av_malloc(size + 1);
+    if (!str)
+        return NULL;
+    n = avio_get_str(pb, size, str, size + 1);
+    if (n < size)
+        avio_skip(pb, size - n);
+    return str;
+}
+
+static int var_read_int(AVIOContext *pb, int size)
+{
+    int v;
+    char *s = var_read_string(pb, size);
+    if (!s)
+        return 0;
+    v = strtol(s, NULL, 10);
+    av_free(s);
+    return v;
+}
+
+static AVRational var_read_float(AVIOContext *pb, int size)
+{
+    AVRational v;
+    char *s = var_read_string(pb, size);
+    if (!s)
+        return (AVRational) { 0, 0 };
+    v = av_d2q(av_strtod(s, NULL), INT_MAX);
+    av_free(s);
+    return v;
+}
+
+static void var_read_metadata(AVFormatContext *avctx, const char *tag, int size)
+{
+    char *value = var_read_string(avctx->pb, size);
+    if (value)
+        av_dict_set(&avctx->metadata, tag, value, AV_DICT_DONT_STRDUP_VAL);
+}
+
+static int set_channels(AVFormatContext *avctx, AVStream *st, int channels)
+{
+    if (channels <= 0) {
+        av_log(avctx, AV_LOG_ERROR, "Channel count %d invalid.\n", channels);
+        return AVERROR_INVALIDDATA;
+    }
+    st->codec->channels       = channels;
+    st->codec->channel_layout = (st->codec->channels == 1) ? AV_CH_LAYOUT_MONO
+                                                           : AV_CH_LAYOUT_STEREO;
+    return 0;
+}
+
+/**
+ * Parse global variable
+ * @return < 0 if unknown
+ */
+static int parse_global_var(AVFormatContext *avctx, AVStream *st,
+                            const char *name, int size)
+{
+    MvContext *mv = avctx->priv_data;
+    AVIOContext *pb = avctx->pb;
+    if (!strcmp(name, "__NUM_I_TRACKS")) {
+        mv->nb_video_tracks = var_read_int(pb, size);
+    } else if (!strcmp(name, "__NUM_A_TRACKS")) {
+        mv->nb_audio_tracks = var_read_int(pb, size);
+    } else if (!strcmp(name, "COMMENT") || !strcmp(name, "TITLE")) {
+        var_read_metadata(avctx, name, size);
+    } else if (!strcmp(name, "LOOP_MODE") || !strcmp(name, "NUM_LOOPS") ||
+               !strcmp(name, "OPTIMIZED")) {
+        avio_skip(pb, size); // ignore
+    } else
+        return AVERROR_INVALIDDATA;
+
+    return 0;
+}
+
+/**
+ * Parse audio variable
+ * @return < 0 if unknown
+ */
+static int parse_audio_var(AVFormatContext *avctx, AVStream *st,
+                           const char *name, int size)
+{
+    MvContext *mv = avctx->priv_data;
+    AVIOContext *pb = avctx->pb;
+    if (!strcmp(name, "__DIR_COUNT")) {
+        st->nb_frames = var_read_int(pb, size);
+    } else if (!strcmp(name, "AUDIO_FORMAT")) {
+        mv->aformat = var_read_int(pb, size);
+    } else if (!strcmp(name, "COMPRESSION")) {
+        mv->acompression = var_read_int(pb, size);
+    } else if (!strcmp(name, "DEFAULT_VOL")) {
+        var_read_metadata(avctx, name, size);
+    } else if (!strcmp(name, "NUM_CHANNELS")) {
+        return set_channels(avctx, st, var_read_int(pb, size));
+    } else if (!strcmp(name, "SAMPLE_RATE")) {
+        st->codec->sample_rate = var_read_int(pb, size);
+        avpriv_set_pts_info(st, 33, 1, st->codec->sample_rate);
+    } else if (!strcmp(name, "SAMPLE_WIDTH")) {
+        st->codec->bits_per_coded_sample = var_read_int(pb, size) * 8;
+    } else
+        return AVERROR_INVALIDDATA;
+
+    return 0;
+}
+
+/**
+ * Parse video variable
+ * @return < 0 if unknown
+ */
+static int parse_video_var(AVFormatContext *avctx, AVStream *st,
+                           const char *name, int size)
+{
+    AVIOContext *pb = avctx->pb;
+    if (!strcmp(name, "__DIR_COUNT")) {
+        st->nb_frames = st->duration = var_read_int(pb, size);
+    } else if (!strcmp(name, "COMPRESSION")) {
+        char *str = var_read_string(pb, size);
+        if (!str)
+            return AVERROR_INVALIDDATA;
+        if (!strcmp(str, "1")) {
+            st->codec->codec_id = AV_CODEC_ID_MVC1;
+        } else if (!strcmp(str, "2")) {
+            st->codec->pix_fmt  = AV_PIX_FMT_ABGR;
+            st->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
+        } else if (!strcmp(str, "3")) {
+            st->codec->codec_id = AV_CODEC_ID_SGIRLE;
+        } else if (!strcmp(str, "10")) {
+            st->codec->codec_id = AV_CODEC_ID_MJPEG;
+        } else if (!strcmp(str, "MVC2")) {
+            st->codec->codec_id = AV_CODEC_ID_MVC2;
+        } else {
+            avpriv_request_sample(avctx, "Video compression %s", str);
+        }
+        av_free(str);
+    } else if (!strcmp(name, "FPS")) {
+        AVRational fps = var_read_float(pb, size);
+        avpriv_set_pts_info(st, 64, fps.den, fps.num);
+        st->avg_frame_rate = fps;
+    } else if (!strcmp(name, "HEIGHT")) {
+        st->codec->height = var_read_int(pb, size);
+    } else if (!strcmp(name, "PIXEL_ASPECT")) {
+        st->sample_aspect_ratio = var_read_float(pb, size);
+        av_reduce(&st->sample_aspect_ratio.num, &st->sample_aspect_ratio.den,
+                  st->sample_aspect_ratio.num, st->sample_aspect_ratio.den,
+                  INT_MAX);
+    } else if (!strcmp(name, "WIDTH")) {
+        st->codec->width = var_read_int(pb, size);
+    } else if (!strcmp(name, "ORIENTATION")) {
+        if (var_read_int(pb, size) == 1101) {
+            st->codec->extradata      = av_strdup("BottomUp");
+            st->codec->extradata_size = 9;
+        }
+    } else if (!strcmp(name, "Q_SPATIAL") || !strcmp(name, "Q_TEMPORAL")) {
+        var_read_metadata(avctx, name, size);
+    } else if (!strcmp(name, "INTERLACING") || !strcmp(name, "PACKING")) {
+        avio_skip(pb, size); // ignore
+    } else
+        return AVERROR_INVALIDDATA;
+
+    return 0;
+}
+
+static void read_table(AVFormatContext *avctx, AVStream *st,
+                       int (*parse)(AVFormatContext *avctx, AVStream *st,
+                                    const char *name, int size))
+{
+    int count, i;
+    AVIOContext *pb = avctx->pb;
+    avio_skip(pb, 4);
+    count = avio_rb32(pb);
+    avio_skip(pb, 4);
+    for (i = 0; i < count; i++) {
+        char name[17];
+        int size;
+        avio_read(pb, name, 16);
+        name[sizeof(name) - 1] = 0;
+        size = avio_rb32(pb);
+        if (parse(avctx, st, name, size) < 0) {
+            avpriv_request_sample(avctx, "Variable %s", name);
+            avio_skip(pb, size);
+        }
+    }
+}
+
+static void read_index(AVIOContext *pb, AVStream *st)
+{
+    uint64_t timestamp = 0;
+    int i;
+    for (i = 0; i < st->nb_frames; i++) {
+        uint32_t pos  = avio_rb32(pb);
+        uint32_t size = avio_rb32(pb);
+        avio_skip(pb, 8);
+        av_add_index_entry(st, pos, timestamp, size, 0, AVINDEX_KEYFRAME);
+        if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
+            timestamp += size / (st->codec->channels * 2);
+        } else {
+            timestamp++;
+        }
+    }
+}
+
+static int mv_read_header(AVFormatContext *avctx)
+{
+    MvContext *mv = avctx->priv_data;
+    AVIOContext *pb = avctx->pb;
+    AVStream *ast = NULL, *vst = NULL;
+    int version, i;
+
+    avio_skip(pb, 4);
+
+    version = avio_rb16(pb);
+    if (version == 2) {
+        uint64_t timestamp;
+        int v;
+        avio_skip(pb, 22);
+
+        /* allocate audio track first to prevent unnecessary seeking
+         * (audio packet always precede video packet for a given frame) */
+        ast = avformat_new_stream(avctx, NULL);
+        if (!ast)
+            return AVERROR(ENOMEM);
+
+        vst = avformat_new_stream(avctx, NULL);
+        if (!vst)
+            return AVERROR(ENOMEM);
+        avpriv_set_pts_info(vst, 64, 1, 15);
+        vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
+        vst->avg_frame_rate    = av_inv_q(vst->time_base);
+        vst->nb_frames         = avio_rb32(pb);
+        v = avio_rb32(pb);
+        switch (v) {
+        case 1:
+            vst->codec->codec_id = AV_CODEC_ID_MVC1;
+            break;
+        case 2:
+            vst->codec->pix_fmt  = AV_PIX_FMT_ARGB;
+            vst->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
+            break;
+        default:
+            avpriv_request_sample(avctx, "Video compression %i", v);
+            break;
+        }
+        vst->codec->codec_tag = 0;
+        vst->codec->width     = avio_rb32(pb);
+        vst->codec->height    = avio_rb32(pb);
+        avio_skip(pb, 12);
+
+        ast->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
+        ast->nb_frames          = vst->nb_frames;
+        ast->codec->sample_rate = avio_rb32(pb);
+        avpriv_set_pts_info(ast, 33, 1, ast->codec->sample_rate);
+        if (set_channels(avctx, ast, avio_rb32(pb)) < 0)
+            return AVERROR_INVALIDDATA;
+
+        v = avio_rb32(pb);
+        if (v == AUDIO_FORMAT_SIGNED) {
+            ast->codec->codec_id = AV_CODEC_ID_PCM_S16BE;
+        } else {
+            avpriv_request_sample(avctx, "Audio compression (format %i)", v);
+        }
+
+        avio_skip(pb, 12);
+        var_read_metadata(avctx, "title", 0x80);
+        var_read_metadata(avctx, "comment", 0x100);
+        avio_skip(pb, 0x80);
+
+        timestamp = 0;
+        for (i = 0; i < vst->nb_frames; i++) {
+            uint32_t pos   = avio_rb32(pb);
+            uint32_t asize = avio_rb32(pb);
+            uint32_t vsize = avio_rb32(pb);
+            avio_skip(pb, 8);
+            av_add_index_entry(ast, pos, timestamp, asize, 0, AVINDEX_KEYFRAME);
+            av_add_index_entry(vst, pos + asize, i, vsize, 0, AVINDEX_KEYFRAME);
+            timestamp += asize / (ast->codec->channels * 2);
+        }
+    } else if (!version && avio_rb16(pb) == 3) {
+        avio_skip(pb, 4);
+
+        read_table(avctx, NULL, parse_global_var);
+
+        if (mv->nb_audio_tracks > 1) {
+            avpriv_request_sample(avctx, "Multiple audio streams support");
+            return AVERROR_PATCHWELCOME;
+        } else if (mv->nb_audio_tracks) {
+            ast = avformat_new_stream(avctx, NULL);
+            if (!ast)
+                return AVERROR(ENOMEM);
+            ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
+            read_table(avctx, ast, parse_audio_var);
+            if (mv->acompression == 100 &&
+                mv->aformat == AUDIO_FORMAT_SIGNED &&
+                ast->codec->bits_per_coded_sample == 16) {
+                ast->codec->codec_id = AV_CODEC_ID_PCM_S16BE;
+            } else {
+                avpriv_request_sample(avctx,
+                                      "Audio compression %i (format %i, sr %i)",
+                                      mv->acompression, mv->aformat,
+                                      ast->codec->bits_per_coded_sample);
+                ast->codec->codec_id = AV_CODEC_ID_NONE;
+            }
+            if (ast->codec->channels <= 0) {
+                av_log(avctx, AV_LOG_ERROR, "No valid channel count found.\n");
+                return AVERROR_INVALIDDATA;
+            }
+        }
+
+        if (mv->nb_video_tracks > 1) {
+            avpriv_request_sample(avctx, "Multiple video streams support");
+            return AVERROR_PATCHWELCOME;
+        } else if (mv->nb_video_tracks) {
+            vst = avformat_new_stream(avctx, NULL);
+            if (!vst)
+                return AVERROR(ENOMEM);
+            vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
+            read_table(avctx, vst, parse_video_var);
+        }
+
+        if (mv->nb_audio_tracks)
+            read_index(pb, ast);
+
+        if (mv->nb_video_tracks)
+            read_index(pb, vst);
+    } else {
+        avpriv_request_sample(avctx, "Version %i", version);
+        return AVERROR_PATCHWELCOME;
+    }
+
+    return 0;
+}
+
+static int mv_read_packet(AVFormatContext *avctx, AVPacket *pkt)
+{
+    MvContext *mv = avctx->priv_data;
+    AVIOContext *pb = avctx->pb;
+    AVStream *st = avctx->streams[mv->stream_index];
+    const AVIndexEntry *index;
+    int frame = mv->frame[mv->stream_index];
+    int ret;
+    uint64_t pos;
+
+    if (frame < st->nb_index_entries) {
+        index = &st->index_entries[frame];
+        pos   = avio_tell(pb);
+        if (index->pos > pos)
+            avio_skip(pb, index->pos - pos);
+        else if (index->pos < pos) {
+            if (!pb->seekable)
+                return AVERROR(EIO);
+            ret = avio_seek(pb, index->pos, SEEK_SET);
+            if (ret < 0)
+                return ret;
+        }
+        ret = av_get_packet(pb, pkt, index->size);
+        if (ret < 0)
+            return ret;
+
+        pkt->stream_index = mv->stream_index;
+        pkt->pts          = index->timestamp;
+        pkt->flags       |= AV_PKT_FLAG_KEY;
+
+        mv->frame[mv->stream_index]++;
+        mv->eof_count = 0;
+    } else {
+        mv->eof_count++;
+        if (mv->eof_count >= avctx->nb_streams)
+            return AVERROR_EOF;
+
+        // avoid returning 0 without a packet
+        return AVERROR(EAGAIN);
+    }
+
+    mv->stream_index++;
+    if (mv->stream_index >= avctx->nb_streams)
+        mv->stream_index = 0;
+
+    return 0;
+}
+
+static int mv_read_seek(AVFormatContext *avctx, int stream_index,
+                        int64_t timestamp, int flags)
+{
+    MvContext *mv = avctx->priv_data;
+    AVStream *st = avctx->streams[stream_index];
+    int frame, i;
+
+    if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
+        return AVERROR(ENOSYS);
+
+    if (!avctx->pb->seekable)
+        return AVERROR(EIO);
+
+    frame = av_index_search_timestamp(st, timestamp, flags);
+    if (frame < 0)
+        return AVERROR_INVALIDDATA;
+
+    for (i = 0; i < avctx->nb_streams; i++)
+        mv->frame[i] = frame;
+    return 0;
+}
+
+AVInputFormat ff_mv_demuxer = {
+    .name           = "mv",
+    .long_name      = NULL_IF_CONFIG_SMALL("Silicon Graphics Movie"),
+    .priv_data_size = sizeof(MvContext),
+    .read_probe     = mv_probe,
+    .read_header    = mv_read_header,
+    .read_packet    = mv_read_packet,
+    .read_seek      = mv_read_seek,
+};