425 lines
14 KiB
C
425 lines
14 KiB
C
/*
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* Silicon Graphics Movie demuxer
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* Copyright (c) 2012 Peter Ross
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Silicon Graphics Movie demuxer
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*/
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#include "libavutil/eval.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/rational.h"
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#include "avformat.h"
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#include "internal.h"
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typedef struct {
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int nb_video_tracks;
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int nb_audio_tracks;
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int eof_count; /**< number of streams that have finished */
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int stream_index; /**< current stream index */
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int frame[2]; /**< frame nb for current stream */
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} MvContext;
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#define AUDIO_FORMAT_SIGNED 401
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static int mv_probe(AVProbeData *p)
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{
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if (AV_RB32(p->buf) == MKBETAG('M','O','V','I') && AV_RB16(p->buf + 4) < 3)
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return AVPROBE_SCORE_MAX;
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return 0;
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}
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static char * var_read_string(AVIOContext *pb, int size)
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{
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char *str = av_malloc(size + 1);
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int n;
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if (!str)
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return NULL;
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n = avio_get_str(pb, size, str, size + 1);
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if (n < size)
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avio_skip(pb, size - n);
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return str;
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}
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static int var_read_int(AVIOContext *pb, int size)
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{
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int v;
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char * s = var_read_string(pb, size);
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if (!s || sscanf(s, "%d", &v) != 1)
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v = 0;
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av_free(s);
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return v;
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}
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static AVRational var_read_float(AVIOContext *pb, int size)
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{
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AVRational v;
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char * s = var_read_string(pb, size);
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if (!s)
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return (AVRational){0, 0};
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v = av_d2q(av_strtod(s, NULL), INT_MAX);
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av_free(s);
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return v;
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}
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static void var_read_metadata(AVFormatContext *avctx, const char *tag, int size)
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{
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char *value = var_read_string(avctx->pb, size);
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if (value)
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av_dict_set(&avctx->metadata, tag, value, AV_DICT_DONT_STRDUP_VAL);
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}
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/**
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* Parse global variable
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* @return < 0 if unknown
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*/
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static int parse_global_var(AVFormatContext *avctx, AVStream *st, const char *name, int size)
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{
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MvContext *mv = avctx->priv_data;
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AVIOContext *pb = avctx->pb;
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if (!strcmp(name, "__NUM_I_TRACKS")) {
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mv->nb_video_tracks = var_read_int(pb, size);
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} else if (!strcmp(name, "__NUM_A_TRACKS")) {
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mv->nb_audio_tracks = var_read_int(pb, size);
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} else if (!strcmp(name, "COMMENT") || !strcmp(name, "TITLE")) {
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var_read_metadata(avctx, name, size);
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} else if (!strcmp(name, "LOOP_MODE") || !strcmp(name, "NUM_LOOPS") || !strcmp(name, "OPTIMIZED")) {
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avio_skip(pb, size); // ignore
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} else
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return -1;
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return 0;
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}
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/**
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* Parse audio variable
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* @return < 0 if unknown
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*/
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static int parse_audio_var(AVFormatContext *avctx, AVStream *st, const char *name, int size)
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{
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AVIOContext *pb = avctx->pb;
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if (!strcmp(name, "__DIR_COUNT")) {
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st->nb_frames = var_read_int(pb, size);
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} else if (!strcmp(name, "AUDIO_FORMAT")) {
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st->codec->codec_id = var_read_int(pb, size);
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} else if (!strcmp(name, "COMPRESSION")) {
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st->codec->codec_tag = var_read_int(pb, size);
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} else if (!strcmp(name, "DEFAULT_VOL")) {
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var_read_metadata(avctx, name, size);
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} else if (!strcmp(name, "NUM_CHANNELS")) {
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st->codec->channels = var_read_int(pb, size);
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st->codec->channel_layout = (st->codec->channels == 1) ? AV_CH_LAYOUT_MONO : AV_CH_LAYOUT_STEREO;
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} else if (!strcmp(name, "SAMPLE_RATE")) {
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st->codec->sample_rate = var_read_int(pb, size);
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avpriv_set_pts_info(st, 33, 1, st->codec->sample_rate);
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} else if (!strcmp(name, "SAMPLE_WIDTH")) {
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st->codec->bits_per_coded_sample = var_read_int(pb, size) * 8;
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} else
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return -1;
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return 0;
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}
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/**
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* Parse video variable
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* @return < 0 if unknown
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*/
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static int parse_video_var(AVFormatContext *avctx, AVStream *st, const char *name, int size)
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{
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AVIOContext *pb = avctx->pb;
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if (!strcmp(name, "__DIR_COUNT")) {
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st->nb_frames = st->duration = var_read_int(pb, size);
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} else if (!strcmp(name, "COMPRESSION")) {
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char * str = var_read_string(pb, size);
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if (!strcmp(str, "1")) {
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st->codec->codec_id = AV_CODEC_ID_MVC1;
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} else if (!strcmp(str, "2")) {
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st->codec->pix_fmt = AV_PIX_FMT_ABGR;
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st->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
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} else if (!strcmp(str, "3")) {
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st->codec->codec_id = AV_CODEC_ID_SGIRLE;
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} else if (!strcmp(str, "10")) {
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st->codec->codec_id = AV_CODEC_ID_MJPEG;
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} else if (!strcmp(str, "MVC2")) {
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st->codec->codec_id = AV_CODEC_ID_MVC2;
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} else {
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av_log_ask_for_sample(avctx, "unknown video compression %s\n", str);
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}
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av_free(str);
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} else if (!strcmp(name, "FPS")) {
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st->time_base = av_inv_q(var_read_float(pb, size));
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} else if (!strcmp(name, "HEIGHT")) {
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st->codec->height = var_read_int(pb, size);
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} else if (!strcmp(name, "PIXEL_ASPECT")) {
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st->sample_aspect_ratio = var_read_float(pb, size);
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av_reduce(&st->sample_aspect_ratio.num, &st->sample_aspect_ratio.den,
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st->sample_aspect_ratio.num, st->sample_aspect_ratio.den, INT_MAX);
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} else if (!strcmp(name, "WIDTH")) {
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st->codec->width = var_read_int(pb, size);
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} else if (!strcmp(name, "ORIENTATION")) {
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if (var_read_int(pb, size) == 1101) {
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st->codec->extradata = av_strdup("BottomUp");
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st->codec->extradata_size = 9;
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}
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} else if (!strcmp(name, "Q_SPATIAL") || !strcmp(name, "Q_TEMPORAL")) {
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var_read_metadata(avctx, name, size);
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} else if (!strcmp(name, "INTERLACING") || !strcmp(name, "PACKING")) {
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avio_skip(pb, size); // ignore
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} else
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return -1;
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return 0;
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}
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static void read_table(AVFormatContext *avctx, AVStream *st, int (*parse)(AVFormatContext *avctx, AVStream *st, const char *name, int size))
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{
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int count, i;
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AVIOContext *pb = avctx->pb;
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avio_skip(pb, 4);
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count = avio_rb32(pb);
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avio_skip(pb, 4);
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for (i = 0; i < count; i++) {
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char name[17];
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int size;
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avio_read(pb, name, 16);
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name[sizeof(name) - 1] = 0;
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size = avio_rb32(pb);
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if (parse(avctx, st, name, size) < 0) {
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av_log_ask_for_sample(avctx, "unknown variable %s\n", name);
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avio_skip(pb, size);
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}
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}
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}
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static void read_index(AVIOContext *pb, AVStream *st)
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{
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uint64_t timestamp = 0;
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int i;
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for (i = 0; i < st->nb_frames; i++) {
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uint32_t pos = avio_rb32(pb);
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uint32_t size = avio_rb32(pb);
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avio_skip(pb, 8);
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av_add_index_entry(st, pos, timestamp, size, 0, AVINDEX_KEYFRAME);
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if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
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timestamp += size / (st->codec->channels * 2);
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} else {
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timestamp++;
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}
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}
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}
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static int mv_read_header(AVFormatContext *avctx)
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{
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MvContext *mv = avctx->priv_data;
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AVIOContext *pb = avctx->pb;
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AVStream *ast = NULL, *vst = NULL; //initialization to suppress warning
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int version, i;
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avio_skip(pb, 4);
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version = avio_rb16(pb);
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if (version == 2) {
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uint64_t timestamp;
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int v;
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avio_skip(pb, 22);
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/* allocate audio track first to prevent unnecessary seeking
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(audio packet always precede video packet for a given frame) */
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ast = avformat_new_stream(avctx, NULL);
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if (!ast)
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return AVERROR(ENOMEM);
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vst = avformat_new_stream(avctx, NULL);
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if (!vst)
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return AVERROR(ENOMEM);
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vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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vst->time_base = (AVRational){1, 15};
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vst->nb_frames = avio_rb32(pb);
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v = avio_rb32(pb);
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switch (v) {
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case 1:
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vst->codec->codec_id = AV_CODEC_ID_MVC1;
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break;
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case 2:
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vst->codec->pix_fmt = AV_PIX_FMT_ARGB;
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vst->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
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break;
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default:
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av_log_ask_for_sample(avctx, "unknown video compression %i\n", v);
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break;
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}
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vst->codec->codec_tag = 0;
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vst->codec->width = avio_rb32(pb);
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vst->codec->height = avio_rb32(pb);
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avio_skip(pb, 12);
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ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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ast->nb_frames = vst->nb_frames;
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ast->codec->sample_rate = avio_rb32(pb);
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avpriv_set_pts_info(ast, 33, 1, ast->codec->sample_rate);
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ast->codec->channels = avio_rb32(pb);
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ast->codec->channel_layout = (ast->codec->channels == 1) ? AV_CH_LAYOUT_MONO : AV_CH_LAYOUT_STEREO;
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v = avio_rb32(pb);
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if (v == AUDIO_FORMAT_SIGNED) {
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ast->codec->codec_id = AV_CODEC_ID_PCM_S16BE;
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} else {
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av_log_ask_for_sample(avctx, "unknown audio compression (format %i)\n", v);
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}
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avio_skip(pb, 12);
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var_read_metadata(avctx, "title", 0x80);
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var_read_metadata(avctx, "comment", 0x100);
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avio_skip(pb, 0x80);
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timestamp = 0;
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for (i = 0; i < vst->nb_frames; i++) {
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uint32_t pos = avio_rb32(pb);
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uint32_t asize = avio_rb32(pb);
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uint32_t vsize = avio_rb32(pb);
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avio_skip(pb, 8);
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av_add_index_entry(ast, pos, timestamp, asize, 0, AVINDEX_KEYFRAME);
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av_add_index_entry(vst, pos + asize, i, vsize, 0, AVINDEX_KEYFRAME);
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timestamp += asize / (ast->codec->channels * 2);
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}
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} else if (!version && avio_rb16(pb) == 3) {
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avio_skip(pb, 4);
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read_table(avctx, NULL, parse_global_var);
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if (mv->nb_audio_tracks > 1) {
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av_log_ask_for_sample(avctx, "multiple audio streams\n");
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return AVERROR_PATCHWELCOME;
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} else if (mv->nb_audio_tracks) {
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ast = avformat_new_stream(avctx, NULL);
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if (!ast)
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return AVERROR(ENOMEM);
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ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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/* temporarily store compression value in codec_tag; format value in codec_id */
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read_table(avctx, ast, parse_audio_var);
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if (ast->codec->codec_tag == 100 && ast->codec->codec_id == AUDIO_FORMAT_SIGNED && ast->codec->bits_per_coded_sample == 16) {
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ast->codec->codec_id = AV_CODEC_ID_PCM_S16BE;
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} else {
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av_log_ask_for_sample(avctx, "unknown audio compression %i (format %i, width %i)\n",
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ast->codec->codec_tag, ast->codec->codec_id, ast->codec->bits_per_coded_sample);
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ast->codec->codec_id = AV_CODEC_ID_NONE;
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}
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ast->codec->codec_tag = 0;
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}
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if (mv->nb_video_tracks > 1) {
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av_log_ask_for_sample(avctx, "multiple video streams\n");
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return AVERROR_PATCHWELCOME;
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} else if (mv->nb_video_tracks) {
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vst = avformat_new_stream(avctx, NULL);
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if (!vst)
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return AVERROR(ENOMEM);
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vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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read_table(avctx, vst, parse_video_var);
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}
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if (mv->nb_audio_tracks)
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read_index(pb, ast);
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if (mv->nb_video_tracks)
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read_index(pb, vst);
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} else {
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av_log_ask_for_sample(avctx, "unknown version %i\n", version);
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return AVERROR_PATCHWELCOME;
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}
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return 0;
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}
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static int mv_read_packet(AVFormatContext *avctx, AVPacket *pkt)
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{
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MvContext *mv = avctx->priv_data;
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AVIOContext *pb = avctx->pb;
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AVStream *st = avctx->streams[mv->stream_index];
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const AVIndexEntry *index;
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int frame = mv->frame[mv->stream_index];
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int ret;
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uint64_t pos;
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if (frame < st->nb_frames) {
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index = &st->index_entries[frame];
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pos = avio_tell(pb);
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if (index->pos > pos)
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avio_skip(pb, index->pos - pos);
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else if (index->pos < pos) {
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if (!pb->seekable)
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return AVERROR(EIO);
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ret = avio_seek(pb, index->pos, SEEK_SET);
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if (ret < 0)
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return ret;
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}
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ret = av_get_packet(pb, pkt, index->size);
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if (ret < 0)
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return ret;
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pkt->stream_index = mv->stream_index;
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pkt->pts = index->timestamp;
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pkt->flags |= AV_PKT_FLAG_KEY;
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mv->frame[mv->stream_index]++;
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mv->eof_count = 0;
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} else {
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mv->eof_count++;
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if (mv->eof_count >= avctx->nb_streams)
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return AVERROR_EOF;
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}
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mv->stream_index++;
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if (mv->stream_index >= avctx->nb_streams)
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mv->stream_index = 0;
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return 0;
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}
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static int mv_read_seek(AVFormatContext *avctx, int stream_index, int64_t timestamp, int flags)
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{
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MvContext *mv = avctx->priv_data;
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AVStream *st = avctx->streams[stream_index];
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int frame, i;
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if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
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return AVERROR(ENOSYS);
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if (!avctx->pb->seekable)
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return AVERROR(EIO);
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frame = av_index_search_timestamp(st, timestamp, flags);
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if (frame < 0)
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return -1;
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for (i = 0; i < avctx->nb_streams; i++)
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mv->frame[i] = frame;
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return 0;
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}
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AVInputFormat ff_mv_demuxer = {
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.name = "mv",
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.long_name = NULL_IF_CONFIG_SMALL("Silicon Graphics Movie"),
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.priv_data_size = sizeof(MvContext),
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.read_probe = mv_probe,
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.read_header = mv_read_header,
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.read_packet = mv_read_packet,
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.read_seek = mv_read_seek,
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};
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