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/* |
* Bink demuxer |
* Copyright (c) 2008-2010 Peter Ross (pross@xvid.org) |
* Copyright (c) 2009 Daniel Verkamp (daniel@drv.nu) |
* |
* This file is part of FFmpeg. |
* |
* FFmpeg is free software; you can redistribute it and/or |
* modify it under the terms of the GNU Lesser General Public |
* License as published by the Free Software Foundation; either |
* version 2.1 of the License, or (at your option) any later version. |
* |
* FFmpeg is distributed in the hope that it will be useful, |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
* Lesser General Public License for more details. |
* |
* You should have received a copy of the GNU Lesser General Public |
* License along with FFmpeg; if not, write to the Free Software |
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
*/ |
|
/** |
* @file |
* Bink demuxer |
* |
* Technical details here: |
* http://wiki.multimedia.cx/index.php?title=Bink_Container |
*/ |
|
#include "libavutil/channel_layout.h" |
#include "libavutil/intreadwrite.h" |
#include "avformat.h" |
#include "internal.h" |
|
enum BinkAudFlags { |
BINK_AUD_16BITS = 0x4000, ///< prefer 16-bit output |
BINK_AUD_STEREO = 0x2000, |
BINK_AUD_USEDCT = 0x1000, |
}; |
|
#define BINK_EXTRADATA_SIZE 1 |
#define BINK_MAX_AUDIO_TRACKS 256 |
#define BINK_MAX_WIDTH 7680 |
#define BINK_MAX_HEIGHT 4800 |
|
typedef struct { |
uint32_t file_size; |
|
uint32_t num_audio_tracks; |
int current_track; ///< audio track to return in next packet |
int64_t video_pts; |
int64_t audio_pts[BINK_MAX_AUDIO_TRACKS]; |
|
uint32_t remain_packet_size; |
} BinkDemuxContext; |
|
static int probe(AVProbeData *p) |
{ |
const uint8_t *b = p->buf; |
|
if ( b[0] == 'B' && b[1] == 'I' && b[2] == 'K' && |
(b[3] == 'b' || b[3] == 'f' || b[3] == 'g' || b[3] == 'h' || b[3] == 'i') && |
AV_RL32(b+8) > 0 && // num_frames |
AV_RL32(b+20) > 0 && AV_RL32(b+20) <= BINK_MAX_WIDTH && |
AV_RL32(b+24) > 0 && AV_RL32(b+24) <= BINK_MAX_HEIGHT && |
AV_RL32(b+28) > 0 && AV_RL32(b+32) > 0) // fps num,den |
return AVPROBE_SCORE_MAX; |
return 0; |
} |
|
static int read_header(AVFormatContext *s) |
{ |
BinkDemuxContext *bink = s->priv_data; |
AVIOContext *pb = s->pb; |
uint32_t fps_num, fps_den; |
AVStream *vst, *ast; |
unsigned int i; |
uint32_t pos, next_pos; |
uint16_t flags; |
int keyframe; |
|
vst = avformat_new_stream(s, NULL); |
if (!vst) |
return AVERROR(ENOMEM); |
|
vst->codec->codec_tag = avio_rl32(pb); |
|
bink->file_size = avio_rl32(pb) + 8; |
vst->duration = avio_rl32(pb); |
|
if (vst->duration > 1000000) { |
av_log(s, AV_LOG_ERROR, "invalid header: more than 1000000 frames\n"); |
return AVERROR(EIO); |
} |
|
if (avio_rl32(pb) > bink->file_size) { |
av_log(s, AV_LOG_ERROR, |
"invalid header: largest frame size greater than file size\n"); |
return AVERROR(EIO); |
} |
|
avio_skip(pb, 4); |
|
vst->codec->width = avio_rl32(pb); |
vst->codec->height = avio_rl32(pb); |
|
fps_num = avio_rl32(pb); |
fps_den = avio_rl32(pb); |
if (fps_num == 0 || fps_den == 0) { |
av_log(s, AV_LOG_ERROR, "invalid header: invalid fps (%d/%d)\n", fps_num, fps_den); |
return AVERROR(EIO); |
} |
avpriv_set_pts_info(vst, 64, fps_den, fps_num); |
vst->avg_frame_rate = av_inv_q(vst->time_base); |
|
vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
vst->codec->codec_id = AV_CODEC_ID_BINKVIDEO; |
if (ff_alloc_extradata(vst->codec, 4)) |
return AVERROR(ENOMEM); |
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) { |
av_log(s, AV_LOG_ERROR, |
"invalid header: more than "AV_STRINGIFY(BINK_MAX_AUDIO_TRACKS)" audio tracks (%d)\n", |
bink->num_audio_tracks); |
return AVERROR(EIO); |
} |
|
if (bink->num_audio_tracks) { |
avio_skip(pb, 4 * bink->num_audio_tracks); |
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for (i = 0; i < bink->num_audio_tracks; i++) { |
ast = avformat_new_stream(s, NULL); |
if (!ast) |
return AVERROR(ENOMEM); |
ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
ast->codec->codec_tag = 0; |
ast->codec->sample_rate = avio_rl16(pb); |
avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate); |
flags = avio_rl16(pb); |
ast->codec->codec_id = flags & BINK_AUD_USEDCT ? |
AV_CODEC_ID_BINKAUDIO_DCT : AV_CODEC_ID_BINKAUDIO_RDFT; |
if (flags & BINK_AUD_STEREO) { |
ast->codec->channels = 2; |
ast->codec->channel_layout = AV_CH_LAYOUT_STEREO; |
} else { |
ast->codec->channels = 1; |
ast->codec->channel_layout = AV_CH_LAYOUT_MONO; |
} |
if (ff_alloc_extradata(ast->codec, 4)) |
return AVERROR(ENOMEM); |
AV_WL32(ast->codec->extradata, vst->codec->codec_tag); |
} |
|
for (i = 0; i < bink->num_audio_tracks; i++) |
s->streams[i + 1]->id = avio_rl32(pb); |
} |
|
/* frame index table */ |
next_pos = avio_rl32(pb); |
for (i = 0; i < vst->duration; i++) { |
pos = next_pos; |
if (i == vst->duration - 1) { |
next_pos = bink->file_size; |
keyframe = 0; |
} else { |
next_pos = avio_rl32(pb); |
keyframe = pos & 1; |
} |
pos &= ~1; |
next_pos &= ~1; |
|
if (next_pos <= pos) { |
av_log(s, AV_LOG_ERROR, "invalid frame index table\n"); |
return AVERROR(EIO); |
} |
av_add_index_entry(vst, pos, i, next_pos - pos, 0, |
keyframe ? AVINDEX_KEYFRAME : 0); |
} |
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avio_skip(pb, 4); |
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bink->current_track = -1; |
return 0; |
} |
|
static int read_packet(AVFormatContext *s, AVPacket *pkt) |
{ |
BinkDemuxContext *bink = s->priv_data; |
AVIOContext *pb = s->pb; |
int ret; |
|
if (bink->current_track < 0) { |
int index_entry; |
AVStream *st = s->streams[0]; // stream 0 is video stream with index |
|
if (bink->video_pts >= st->duration) |
return AVERROR_EOF; |
|
index_entry = av_index_search_timestamp(st, bink->video_pts, |
AVSEEK_FLAG_ANY); |
if (index_entry < 0) { |
av_log(s, AV_LOG_ERROR, |
"could not find index entry for frame %"PRId64"\n", |
bink->video_pts); |
return AVERROR(EIO); |
} |
|
bink->remain_packet_size = st->index_entries[index_entry].size; |
bink->current_track = 0; |
} |
|
while (bink->current_track < bink->num_audio_tracks) { |
uint32_t audio_size = avio_rl32(pb); |
if (audio_size > bink->remain_packet_size - 4) { |
av_log(s, AV_LOG_ERROR, |
"frame %"PRId64": audio size in header (%u) > size of packet left (%u)\n", |
bink->video_pts, audio_size, bink->remain_packet_size); |
return AVERROR(EIO); |
} |
bink->remain_packet_size -= 4 + audio_size; |
bink->current_track++; |
if (audio_size >= 4) { |
/* get one audio packet per track */ |
if ((ret = av_get_packet(pb, pkt, audio_size)) < 0) |
return ret; |
pkt->stream_index = bink->current_track; |
pkt->pts = bink->audio_pts[bink->current_track - 1]; |
|
/* Each audio packet reports the number of decompressed samples |
(in bytes). We use this value to calcuate the audio PTS */ |
if (pkt->size >= 4) |
bink->audio_pts[bink->current_track -1] += |
AV_RL32(pkt->data) / (2 * s->streams[bink->current_track]->codec->channels); |
return 0; |
} else { |
avio_skip(pb, audio_size); |
} |
} |
|
/* get video packet */ |
if ((ret = av_get_packet(pb, pkt, bink->remain_packet_size)) < 0) |
return ret; |
pkt->stream_index = 0; |
pkt->pts = bink->video_pts++; |
pkt->flags |= AV_PKT_FLAG_KEY; |
|
/* -1 instructs the next call to read_packet() to read the next frame */ |
bink->current_track = -1; |
|
return 0; |
} |
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static int read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) |
{ |
BinkDemuxContext *bink = s->priv_data; |
AVStream *vst = s->streams[0]; |
|
if (!s->pb->seekable) |
return -1; |
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/* seek to the first frame */ |
if (avio_seek(s->pb, vst->index_entries[0].pos, SEEK_SET) < 0) |
return -1; |
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bink->video_pts = 0; |
memset(bink->audio_pts, 0, sizeof(bink->audio_pts)); |
bink->current_track = -1; |
return 0; |
} |
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AVInputFormat ff_bink_demuxer = { |
.name = "bink", |
.long_name = NULL_IF_CONFIG_SMALL("Bink"), |
.priv_data_size = sizeof(BinkDemuxContext), |
.read_probe = probe, |
.read_header = read_header, |
.read_packet = read_packet, |
.read_seek = read_seek, |
}; |