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ffmpeg/libavformat/mvdec.c

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/*
* Silicon Graphics Movie demuxer
* Copyright (c) 2012 Peter Ross
*
* 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
* Silicon Graphics Movie demuxer
*/
#include "libavutil/channel_layout.h"
#include "libavutil/eval.h"
#include "libavutil/intfloat.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;
/* these magic numbers are defined in moviefile.h on Silicon Grahpics IRIX */
#define MOVIE_SOUND 1
#define MOVIE_SILENT 2
#define AUDIO_FORMAT_SIGNED 401
static int mv_probe(const 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;
if (size < 0 || size == INT_MAX)
return NULL;
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->codecpar->channels = channels;
st->codecpar->channel_layout = (st->codecpar->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")) {
int sample_rate = var_read_int(pb, size);
if (sample_rate <= 0)
return AVERROR_INVALIDDATA;
st->codecpar->sample_rate = sample_rate;
avpriv_set_pts_info(st, 33, 1, st->codecpar->sample_rate);
} else if (!strcmp(name, "SAMPLE_WIDTH")) {
uint64_t bpc = var_read_int(pb, size) * (uint64_t)8;
if (bpc > 16)
return AVERROR_INVALIDDATA;
st->codecpar->bits_per_coded_sample = bpc;
} 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->codecpar->codec_id = AV_CODEC_ID_MVC1;
} else if (!strcmp(str, "2")) {
st->codecpar->format = AV_PIX_FMT_ABGR;
st->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
} else if (!strcmp(str, "3")) {
st->codecpar->codec_id = AV_CODEC_ID_SGIRLE;
} else if (!strcmp(str, "10")) {
st->codecpar->codec_id = AV_CODEC_ID_MJPEG;
} else if (!strcmp(str, "MVC2")) {
st->codecpar->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->codecpar->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->codecpar->width = var_read_int(pb, size);
} else if (!strcmp(name, "ORIENTATION")) {
if (var_read_int(pb, size) == 1101) {
if (!st->codecpar->extradata) {
st->codecpar->extradata = av_strdup("BottomUp");
if (!st->codecpar->extradata)
return AVERROR(ENOMEM);
st->codecpar->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 int read_table(AVFormatContext *avctx, AVStream *st,
int (*parse)(AVFormatContext *avctx, AVStream *st,
const char *name, int size))
{
unsigned count;
int 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;
if (avio_feof(pb))
return AVERROR_EOF;
avio_read(pb, name, 16);
name[sizeof(name) - 1] = 0;
size = avio_rb32(pb);
if (size < 0) {
av_log(avctx, AV_LOG_ERROR, "entry size %d is invalid\n", size);
return AVERROR_INVALIDDATA;
}
if (parse(avctx, st, name, size) < 0) {
avpriv_request_sample(avctx, "Variable %s", name);
avio_skip(pb, size);
}
}
return 0;
}
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);
if (avio_feof(pb))
return ;
av_add_index_entry(st, pos, timestamp, size, 0, AVINDEX_KEYFRAME);
if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
timestamp += size / (st->codecpar->channels * 2LL);
} 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;
int ret;
avio_skip(pb, 4);
version = avio_rb16(pb);
if (version == 2) {
uint64_t timestamp;
int v;
uint32_t bytes_per_sample;
AVRational fps;
avio_skip(pb, 10);
fps = av_d2q(av_int2double(avio_rb64(pb)), INT_MAX);
/* allocate audio track first to prevent unnecessary seeking
* (audio packet always precede video packet for a given frame) */
v = avio_rb16(pb);
if (v == MOVIE_SOUND) {
/* movie has sound so allocate an audio stream */
ast = avformat_new_stream(avctx, NULL);
if (!ast)
return AVERROR(ENOMEM);
} else if (v != MOVIE_SILENT)
return AVERROR_INVALIDDATA;
avio_skip(pb, 2);
vst = avformat_new_stream(avctx, NULL);
if (!vst)
return AVERROR(ENOMEM);
avpriv_set_pts_info(vst, 64, fps.den, fps.num);
vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
vst->avg_frame_rate = fps;
vst->duration = vst->nb_frames = avio_rb32(pb);
v = avio_rb32(pb);
switch (v) {
case 1:
vst->codecpar->codec_id = AV_CODEC_ID_MVC1;
break;
case 2:
vst->codecpar->format = AV_PIX_FMT_ARGB;
vst->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
break;
default:
avpriv_request_sample(avctx, "Video compression %i", v);
break;
}
vst->codecpar->codec_tag = 0;
vst->codecpar->width = avio_rb32(pb);
vst->codecpar->height = avio_rb32(pb);
avio_skip(pb, 12);
if (ast) {
ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
ast->nb_frames = vst->nb_frames;
ast->codecpar->sample_rate = avio_rb32(pb);
if (ast->codecpar->sample_rate <= 0) {
av_log(avctx, AV_LOG_ERROR, "Invalid sample rate %d\n", ast->codecpar->sample_rate);
return AVERROR_INVALIDDATA;
}
avpriv_set_pts_info(ast, 33, 1, ast->codecpar->sample_rate);
bytes_per_sample = avio_rb32(pb);
v = avio_rb32(pb);
if (v == AUDIO_FORMAT_SIGNED) {
switch (bytes_per_sample) {
case 1:
ast->codecpar->codec_id = AV_CODEC_ID_PCM_S8;
break;
case 2:
ast->codecpar->codec_id = AV_CODEC_ID_PCM_S16BE;
break;
default:
avpriv_request_sample(avctx, "Audio sample size %i bytes", bytes_per_sample);
break;
}
} else {
avpriv_request_sample(avctx, "Audio compression (format %i)", v);
}
if (bytes_per_sample == 0)
return AVERROR_INVALIDDATA;
if (set_channels(avctx, ast, avio_rb32(pb)) < 0)
return AVERROR_INVALIDDATA;
avio_skip(pb, 8);
} else
avio_skip(pb, 24); /* skip meaningless audio metadata */
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);
if (avio_feof(pb))
return AVERROR_INVALIDDATA;
avio_skip(pb, 8);
if (ast) {
av_add_index_entry(ast, pos, timestamp, asize, 0, AVINDEX_KEYFRAME);
timestamp += asize / (ast->codecpar->channels * (uint64_t)bytes_per_sample);
}
av_add_index_entry(vst, pos + asize, i, vsize, 0, AVINDEX_KEYFRAME);
}
} else if (!version && avio_rb16(pb) == 3) {
avio_skip(pb, 4);
if ((ret = read_table(avctx, NULL, parse_global_var)) < 0)
return ret;
if (mv->nb_audio_tracks < 0 || mv->nb_video_tracks < 0 ||
(mv->nb_audio_tracks == 0 && mv->nb_video_tracks == 0)) {
av_log(avctx, AV_LOG_ERROR, "Stream count is invalid.\n");
return AVERROR_INVALIDDATA;
}
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->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
if ((ret = read_table(avctx, ast, parse_audio_var)) < 0)
return ret;
if (mv->acompression == 100 &&
mv->aformat == AUDIO_FORMAT_SIGNED &&
ast->codecpar->bits_per_coded_sample == 16) {
ast->codecpar->codec_id = AV_CODEC_ID_PCM_S16BE;
} else {
avpriv_request_sample(avctx,
"Audio compression %i (format %i, sr %i)",
mv->acompression, mv->aformat,
ast->codecpar->bits_per_coded_sample);
ast->codecpar->codec_id = AV_CODEC_ID_NONE;
}
if (ast->codecpar->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->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
if ((ret = read_table(avctx, vst, parse_video_var))<0)
return ret;
}
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];
FFStream *const sti = ffstream(st);
const AVIndexEntry *index;
int frame = mv->frame[mv->stream_index];
int64_t ret;
uint64_t pos;
if (frame < sti->nb_index_entries) {
index = &sti->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 & AVIO_SEEKABLE_NORMAL))
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 & AVIO_SEEKABLE_NORMAL))
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;
}
const 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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