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284 lines
8.9 KiB
284 lines
8.9 KiB
/* |
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* Bink demuxer |
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* Copyright (c) 2008-2010 Peter Ross (pross@xvid.org) |
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* Copyright (c) 2009 Daniel Verkamp (daniel@drv.nu) |
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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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* Bink demuxer |
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* |
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* Technical details here: |
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* http://wiki.multimedia.cx/index.php?title=Bink_Container |
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*/ |
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#include "libavutil/channel_layout.h" |
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#include "libavutil/intreadwrite.h" |
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#include "avformat.h" |
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#include "internal.h" |
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enum BinkAudFlags { |
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BINK_AUD_16BITS = 0x4000, ///< prefer 16-bit output |
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BINK_AUD_STEREO = 0x2000, |
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BINK_AUD_USEDCT = 0x1000, |
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}; |
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#define BINK_EXTRADATA_SIZE 1 |
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#define BINK_MAX_AUDIO_TRACKS 256 |
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#define BINK_MAX_WIDTH 7680 |
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#define BINK_MAX_HEIGHT 4800 |
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typedef struct { |
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uint32_t file_size; |
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uint32_t num_audio_tracks; |
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int current_track; ///< audio track to return in next packet |
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int64_t video_pts; |
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int64_t audio_pts[BINK_MAX_AUDIO_TRACKS]; |
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uint32_t remain_packet_size; |
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} BinkDemuxContext; |
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static int probe(AVProbeData *p) |
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{ |
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const uint8_t *b = p->buf; |
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if ( b[0] == 'B' && b[1] == 'I' && b[2] == 'K' && |
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(b[3] == 'b' || b[3] == 'f' || b[3] == 'g' || b[3] == 'h' || b[3] == 'i') && |
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AV_RL32(b+8) > 0 && // num_frames |
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AV_RL32(b+20) > 0 && AV_RL32(b+20) <= BINK_MAX_WIDTH && |
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AV_RL32(b+24) > 0 && AV_RL32(b+24) <= BINK_MAX_HEIGHT && |
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AV_RL32(b+28) > 0 && AV_RL32(b+32) > 0) // fps num,den |
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return AVPROBE_SCORE_MAX; |
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return 0; |
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} |
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static int read_header(AVFormatContext *s) |
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{ |
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BinkDemuxContext *bink = s->priv_data; |
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AVIOContext *pb = s->pb; |
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uint32_t fps_num, fps_den; |
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AVStream *vst, *ast; |
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unsigned int i; |
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uint32_t pos, next_pos; |
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uint16_t flags; |
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int keyframe; |
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vst = avformat_new_stream(s, NULL); |
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if (!vst) |
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return AVERROR(ENOMEM); |
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vst->codec->codec_tag = avio_rl32(pb); |
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bink->file_size = avio_rl32(pb) + 8; |
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vst->duration = avio_rl32(pb); |
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if (vst->duration > 1000000) { |
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av_log(s, AV_LOG_ERROR, "invalid header: more than 1000000 frames\n"); |
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return AVERROR(EIO); |
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} |
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if (avio_rl32(pb) > bink->file_size) { |
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av_log(s, AV_LOG_ERROR, |
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"invalid header: largest frame size greater than file size\n"); |
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return AVERROR(EIO); |
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} |
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avio_skip(pb, 4); |
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vst->codec->width = avio_rl32(pb); |
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vst->codec->height = avio_rl32(pb); |
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fps_num = avio_rl32(pb); |
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fps_den = avio_rl32(pb); |
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if (fps_num == 0 || fps_den == 0) { |
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av_log(s, AV_LOG_ERROR, "invalid header: invalid fps (%d/%d)\n", fps_num, fps_den); |
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return AVERROR(EIO); |
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} |
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avpriv_set_pts_info(vst, 64, fps_den, fps_num); |
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vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
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vst->codec->codec_id = AV_CODEC_ID_BINKVIDEO; |
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vst->codec->extradata = av_mallocz(4 + FF_INPUT_BUFFER_PADDING_SIZE); |
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vst->codec->extradata_size = 4; |
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avio_read(pb, vst->codec->extradata, 4); |
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bink->num_audio_tracks = avio_rl32(pb); |
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if (bink->num_audio_tracks > BINK_MAX_AUDIO_TRACKS) { |
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av_log(s, AV_LOG_ERROR, |
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"invalid header: more than "AV_STRINGIFY(BINK_MAX_AUDIO_TRACKS)" audio tracks (%d)\n", |
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bink->num_audio_tracks); |
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return AVERROR(EIO); |
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} |
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if (bink->num_audio_tracks) { |
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avio_skip(pb, 4 * bink->num_audio_tracks); |
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for (i = 0; i < bink->num_audio_tracks; i++) { |
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ast = avformat_new_stream(s, 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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ast->codec->codec_tag = 0; |
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ast->codec->sample_rate = avio_rl16(pb); |
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avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate); |
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flags = avio_rl16(pb); |
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ast->codec->codec_id = flags & BINK_AUD_USEDCT ? |
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AV_CODEC_ID_BINKAUDIO_DCT : AV_CODEC_ID_BINKAUDIO_RDFT; |
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if (flags & BINK_AUD_STEREO) { |
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ast->codec->channels = 2; |
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ast->codec->channel_layout = AV_CH_LAYOUT_STEREO; |
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} else { |
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ast->codec->channels = 1; |
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ast->codec->channel_layout = AV_CH_LAYOUT_MONO; |
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} |
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ast->codec->extradata = av_mallocz(4 + FF_INPUT_BUFFER_PADDING_SIZE); |
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if (!ast->codec->extradata) |
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return AVERROR(ENOMEM); |
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ast->codec->extradata_size = 4; |
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AV_WL32(ast->codec->extradata, vst->codec->codec_tag); |
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} |
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for (i = 0; i < bink->num_audio_tracks; i++) |
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s->streams[i + 1]->id = avio_rl32(pb); |
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} |
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/* frame index table */ |
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next_pos = avio_rl32(pb); |
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for (i = 0; i < vst->duration; i++) { |
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pos = next_pos; |
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if (i == vst->duration - 1) { |
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next_pos = bink->file_size; |
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keyframe = 0; |
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} else { |
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next_pos = avio_rl32(pb); |
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keyframe = pos & 1; |
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} |
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pos &= ~1; |
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next_pos &= ~1; |
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if (next_pos <= pos) { |
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av_log(s, AV_LOG_ERROR, "invalid frame index table\n"); |
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return AVERROR(EIO); |
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} |
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av_add_index_entry(vst, pos, i, next_pos - pos, 0, |
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keyframe ? AVINDEX_KEYFRAME : 0); |
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} |
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avio_skip(pb, 4); |
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bink->current_track = -1; |
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return 0; |
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} |
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static int read_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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BinkDemuxContext *bink = s->priv_data; |
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AVIOContext *pb = s->pb; |
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int ret; |
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if (bink->current_track < 0) { |
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int index_entry; |
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AVStream *st = s->streams[0]; // stream 0 is video stream with index |
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if (bink->video_pts >= st->duration) |
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return AVERROR(EIO); |
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index_entry = av_index_search_timestamp(st, bink->video_pts, |
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AVSEEK_FLAG_ANY); |
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if (index_entry < 0) { |
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av_log(s, AV_LOG_ERROR, |
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"could not find index entry for frame %"PRId64"\n", |
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bink->video_pts); |
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return AVERROR(EIO); |
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} |
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bink->remain_packet_size = st->index_entries[index_entry].size; |
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bink->current_track = 0; |
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} |
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while (bink->current_track < bink->num_audio_tracks) { |
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uint32_t audio_size = avio_rl32(pb); |
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if (audio_size > bink->remain_packet_size - 4) { |
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av_log(s, AV_LOG_ERROR, |
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"frame %"PRId64": audio size in header (%u) > size of packet left (%u)\n", |
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bink->video_pts, audio_size, bink->remain_packet_size); |
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return AVERROR(EIO); |
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} |
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bink->remain_packet_size -= 4 + audio_size; |
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bink->current_track++; |
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if (audio_size >= 4) { |
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/* get one audio packet per track */ |
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if ((ret = av_get_packet(pb, pkt, audio_size)) < 0) |
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return ret; |
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pkt->stream_index = bink->current_track; |
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pkt->pts = bink->audio_pts[bink->current_track - 1]; |
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/* Each audio packet reports the number of decompressed samples |
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(in bytes). We use this value to calcuate the audio PTS */ |
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if (pkt->size >= 4) |
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bink->audio_pts[bink->current_track -1] += |
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AV_RL32(pkt->data) / (2 * s->streams[bink->current_track]->codec->channels); |
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return 0; |
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} else { |
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avio_skip(pb, audio_size); |
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} |
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} |
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/* get video packet */ |
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if ((ret = av_get_packet(pb, pkt, bink->remain_packet_size)) < 0) |
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return ret; |
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pkt->stream_index = 0; |
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pkt->pts = bink->video_pts++; |
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pkt->flags |= AV_PKT_FLAG_KEY; |
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/* -1 instructs the next call to read_packet() to read the next frame */ |
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bink->current_track = -1; |
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return 0; |
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} |
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static int read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) |
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{ |
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BinkDemuxContext *bink = s->priv_data; |
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AVStream *vst = s->streams[0]; |
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if (!s->pb->seekable) |
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return -1; |
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/* seek to the first frame */ |
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if (avio_seek(s->pb, vst->index_entries[0].pos, SEEK_SET) < 0) |
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return -1; |
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bink->video_pts = 0; |
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memset(bink->audio_pts, 0, sizeof(bink->audio_pts)); |
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bink->current_track = -1; |
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return 0; |
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} |
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AVInputFormat ff_bink_demuxer = { |
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.name = "bink", |
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.long_name = NULL_IF_CONFIG_SMALL("Bink"), |
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.priv_data_size = sizeof(BinkDemuxContext), |
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.read_probe = probe, |
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.read_header = read_header, |
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.read_packet = read_packet, |
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.read_seek = read_seek, |
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};
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