On Thu, Mar 13, 2014 at 06:57:26PM +0100, Vittorio Giovara wrote:
> From: Peter Ross <[email protected]>
>
> Signed-off-by: Vittorio Giovara <[email protected]>
> ---
> Changelog | 1 +
> doc/general.texi | 1 +
> libavformat/Makefile | 1 +
> libavformat/allformats.c | 1 +
> libavformat/mvdec.c | 442
> +++++++++++++++++++++++++++++++++++++++++++++++
> libavformat/version.h | 2 +-
> 6 files changed, 447 insertions(+), 1 deletion(-)
> create mode 100644 libavformat/mvdec.c
>
> diff --git a/libavformat/mvdec.c b/libavformat/mvdec.c
> new file mode 100644
> index 0000000..a851c6c
> --- /dev/null
> +++ b/libavformat/mvdec.c
> @@ -0,0 +1,442 @@
> +/*
> + * 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 {
> + 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 */
> +} 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)
> +{
> + char *str = av_malloc(size + 1);
> + int n;
> + 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 || sscanf(s, "%d", &v) != 1)
> + v = 0;
> + 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;
short line and well-valigned too
> + 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")) {
ahem
> + avio_skip(pb, size); // ignore
> + } else
> + return -1;
> +
> + return 0;
> +}
> +
> +/**
> + * Parse audio variable
> + * @return < 0 if unknown
> + */
> +static int parse_audio_var(AVFormatContext *avctx, AVStream *st, const char
> *name, int size)
> +{
> + AVIOContext *pb = avctx->pb;
> + if (!strcmp(name, "__DIR_COUNT")) {
> + st->nb_frames = var_read_int(pb, size);
> + } else if (!strcmp(name, "AUDIO_FORMAT")) {
> + st->codec->codec_id = var_read_int(pb, size);
> + } else if (!strcmp(name, "COMPRESSION")) {
> + st->codec->codec_tag = 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 -1;
> + 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);
> + } 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 -1;
> + 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; //initialization to suppress warning
> + 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);
> + vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
> + avpriv_set_pts_info(vst, 64, 1, 15);
> + 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;
> + /* temporarily store compression value in codec_tag; format
> value in codec_id */
> + read_table(avctx, ast, parse_audio_var);
> + if (ast->codec->codec_tag == 100 && ast->codec->codec_id ==
> 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, width %i)",
> + ast->codec->codec_tag, ast->codec->codec_id,
> ast->codec->bits_per_coded_sample);
> + ast->codec->codec_id = AV_CODEC_ID_NONE;
> + }
> + ast->codec->codec_tag = 0;
> + 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;
valign?
> +
> + mv->frame[mv->stream_index]++;
> + mv->eof_count = 0;
> + } else {
> + mv->eof_count++;
> + if (mv->eof_count >= avctx->nb_streams)
> + return AVERROR_EOF;
> + }
> +
> + 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 -1;
> +
> + 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,
> +};
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