mirror of https://github.com/FFmpeg/FFmpeg.git
Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>pull/66/head
parent
86a0432688
commit
55ddd700c6
6 changed files with 473 additions and 1 deletions
@ -0,0 +1,468 @@ |
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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 Libav. |
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* |
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* Libav 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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* Libav 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 Libav; 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/channel_layout.h" |
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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 MvContext { |
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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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int acompression; ///< compression level for audio stream
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int aformat; ///< audio format
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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') && |
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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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int n; |
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char *str = av_malloc(size + 1); |
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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) |
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return 0; |
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v = strtol(s, NULL, 10); |
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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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static int set_channels(AVFormatContext *avctx, AVStream *st, int channels) |
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{ |
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if (channels <= 0) { |
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av_log(avctx, AV_LOG_ERROR, "Channel count %d invalid.\n", channels); |
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return AVERROR_INVALIDDATA; |
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} |
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st->codec->channels = channels; |
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st->codec->channel_layout = (st->codec->channels == 1) ? AV_CH_LAYOUT_MONO |
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: AV_CH_LAYOUT_STEREO; |
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return 0; |
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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, |
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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") || |
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!strcmp(name, "OPTIMIZED")) { |
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avio_skip(pb, size); // ignore
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} else |
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return AVERROR_INVALIDDATA; |
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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, |
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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, "__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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mv->aformat = var_read_int(pb, size); |
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} else if (!strcmp(name, "COMPRESSION")) { |
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mv->acompression = 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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return set_channels(avctx, st, var_read_int(pb, size)); |
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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 AVERROR_INVALIDDATA; |
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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, |
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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 (!str) |
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return AVERROR_INVALIDDATA; |
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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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avpriv_request_sample(avctx, "Video compression %s", 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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AVRational fps = var_read_float(pb, size); |
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avpriv_set_pts_info(st, 64, fps.den, fps.num); |
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st->avg_frame_rate = fps; |
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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, |
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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 AVERROR_INVALIDDATA; |
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return 0; |
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} |
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static void read_table(AVFormatContext *avctx, AVStream *st, |
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int (*parse)(AVFormatContext *avctx, AVStream *st, |
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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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avpriv_request_sample(avctx, "Variable %s", 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; |
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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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avpriv_set_pts_info(vst, 64, 1, 15); |
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vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
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vst->avg_frame_rate = av_inv_q(vst->time_base); |
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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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avpriv_request_sample(avctx, "Video compression %i", 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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if (set_channels(avctx, ast, avio_rb32(pb)) < 0) |
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return AVERROR_INVALIDDATA; |
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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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avpriv_request_sample(avctx, "Audio compression (format %i)", 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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avpriv_request_sample(avctx, "Multiple audio streams support"); |
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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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read_table(avctx, ast, parse_audio_var); |
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if (mv->acompression == 100 && |
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mv->aformat == AUDIO_FORMAT_SIGNED && |
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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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avpriv_request_sample(avctx, |
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"Audio compression %i (format %i, sr %i)", |
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mv->acompression, mv->aformat, |
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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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if (ast->codec->channels <= 0) { |
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av_log(avctx, AV_LOG_ERROR, "No valid channel count found.\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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} |
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if (mv->nb_video_tracks > 1) { |
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avpriv_request_sample(avctx, "Multiple video streams support"); |
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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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avpriv_request_sample(avctx, "Version %i", 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_index_entries) { |
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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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// avoid returning 0 without a packet
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return AVERROR(EAGAIN); |
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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, |
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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 AVERROR_INVALIDDATA; |
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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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|
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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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