mirror of https://github.com/FFmpeg/FFmpeg.git
parent
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/*
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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, *vst; |
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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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