yading@11: /*
yading@11:  * Bink demuxer
yading@11:  * Copyright (c) 2008-2010 Peter Ross (pross@xvid.org)
yading@11:  * Copyright (c) 2009 Daniel Verkamp (daniel@drv.nu)
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: /**
yading@11:  * @file
yading@11:  * Bink demuxer
yading@11:  *
yading@11:  * Technical details here:
yading@11:  *  http://wiki.multimedia.cx/index.php?title=Bink_Container
yading@11:  */
yading@11: 
yading@11: #include "libavutil/channel_layout.h"
yading@11: #include "libavutil/intreadwrite.h"
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: 
yading@11: enum BinkAudFlags {
yading@11:     BINK_AUD_16BITS = 0x4000, ///< prefer 16-bit output
yading@11:     BINK_AUD_STEREO = 0x2000,
yading@11:     BINK_AUD_USEDCT = 0x1000,
yading@11: };
yading@11: 
yading@11: #define BINK_EXTRADATA_SIZE     1
yading@11: #define BINK_MAX_AUDIO_TRACKS   256
yading@11: #define BINK_MAX_WIDTH          7680
yading@11: #define BINK_MAX_HEIGHT         4800
yading@11: 
yading@11: typedef struct {
yading@11:     uint32_t file_size;
yading@11: 
yading@11:     uint32_t num_audio_tracks;
yading@11:     int current_track;      ///< audio track to return in next packet
yading@11:     int64_t video_pts;
yading@11:     int64_t audio_pts[BINK_MAX_AUDIO_TRACKS];
yading@11: 
yading@11:     uint32_t remain_packet_size;
yading@11: } BinkDemuxContext;
yading@11: 
yading@11: static int probe(AVProbeData *p)
yading@11: {
yading@11:     const uint8_t *b = p->buf;
yading@11: 
yading@11:     if ( b[0] == 'B' && b[1] == 'I' && b[2] == 'K' &&
yading@11:         (b[3] == 'b' || b[3] == 'f' || b[3] == 'g' || b[3] == 'h' || b[3] == 'i') &&
yading@11:         AV_RL32(b+8) > 0 &&  // num_frames
yading@11:         AV_RL32(b+20) > 0 && AV_RL32(b+20) <= BINK_MAX_WIDTH &&
yading@11:         AV_RL32(b+24) > 0 && AV_RL32(b+24) <= BINK_MAX_HEIGHT &&
yading@11:         AV_RL32(b+28) > 0 && AV_RL32(b+32) > 0)  // fps num,den
yading@11:         return AVPROBE_SCORE_MAX;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int read_header(AVFormatContext *s)
yading@11: {
yading@11:     BinkDemuxContext *bink = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     uint32_t fps_num, fps_den;
yading@11:     AVStream *vst, *ast;
yading@11:     unsigned int i;
yading@11:     uint32_t pos, next_pos;
yading@11:     uint16_t flags;
yading@11:     int keyframe;
yading@11: 
yading@11:     vst = avformat_new_stream(s, NULL);
yading@11:     if (!vst)
yading@11:         return AVERROR(ENOMEM);
yading@11: 
yading@11:     vst->codec->codec_tag = avio_rl32(pb);
yading@11: 
yading@11:     bink->file_size = avio_rl32(pb) + 8;
yading@11:     vst->duration   = avio_rl32(pb);
yading@11: 
yading@11:     if (vst->duration > 1000000) {
yading@11:         av_log(s, AV_LOG_ERROR, "invalid header: more than 1000000 frames\n");
yading@11:         return AVERROR(EIO);
yading@11:     }
yading@11: 
yading@11:     if (avio_rl32(pb) > bink->file_size) {
yading@11:         av_log(s, AV_LOG_ERROR,
yading@11:                "invalid header: largest frame size greater than file size\n");
yading@11:         return AVERROR(EIO);
yading@11:     }
yading@11: 
yading@11:     avio_skip(pb, 4);
yading@11: 
yading@11:     vst->codec->width  = avio_rl32(pb);
yading@11:     vst->codec->height = avio_rl32(pb);
yading@11: 
yading@11:     fps_num = avio_rl32(pb);
yading@11:     fps_den = avio_rl32(pb);
yading@11:     if (fps_num == 0 || fps_den == 0) {
yading@11:         av_log(s, AV_LOG_ERROR, "invalid header: invalid fps (%d/%d)\n", fps_num, fps_den);
yading@11:         return AVERROR(EIO);
yading@11:     }
yading@11:     avpriv_set_pts_info(vst, 64, fps_den, fps_num);
yading@11:     vst->avg_frame_rate = av_inv_q(vst->time_base);
yading@11: 
yading@11:     vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
yading@11:     vst->codec->codec_id   = AV_CODEC_ID_BINKVIDEO;
yading@11:     vst->codec->extradata  = av_mallocz(4 + FF_INPUT_BUFFER_PADDING_SIZE);
yading@11:     if (!vst->codec->extradata)
yading@11:         return AVERROR(ENOMEM);
yading@11:     vst->codec->extradata_size = 4;
yading@11:     avio_read(pb, vst->codec->extradata, 4);
yading@11: 
yading@11:     bink->num_audio_tracks = avio_rl32(pb);
yading@11: 
yading@11:     if (bink->num_audio_tracks > BINK_MAX_AUDIO_TRACKS) {
yading@11:         av_log(s, AV_LOG_ERROR,
yading@11:                "invalid header: more than "AV_STRINGIFY(BINK_MAX_AUDIO_TRACKS)" audio tracks (%d)\n",
yading@11:                bink->num_audio_tracks);
yading@11:         return AVERROR(EIO);
yading@11:     }
yading@11: 
yading@11:     if (bink->num_audio_tracks) {
yading@11:         avio_skip(pb, 4 * bink->num_audio_tracks);
yading@11: 
yading@11:         for (i = 0; i < bink->num_audio_tracks; i++) {
yading@11:             ast = avformat_new_stream(s, NULL);
yading@11:             if (!ast)
yading@11:                 return AVERROR(ENOMEM);
yading@11:             ast->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
yading@11:             ast->codec->codec_tag   = 0;
yading@11:             ast->codec->sample_rate = avio_rl16(pb);
yading@11:             avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
yading@11:             flags = avio_rl16(pb);
yading@11:             ast->codec->codec_id = flags & BINK_AUD_USEDCT ?
yading@11:                                    AV_CODEC_ID_BINKAUDIO_DCT : AV_CODEC_ID_BINKAUDIO_RDFT;
yading@11:             if (flags & BINK_AUD_STEREO) {
yading@11:                 ast->codec->channels       = 2;
yading@11:                 ast->codec->channel_layout = AV_CH_LAYOUT_STEREO;
yading@11:             } else {
yading@11:                 ast->codec->channels       = 1;
yading@11:                 ast->codec->channel_layout = AV_CH_LAYOUT_MONO;
yading@11:             }
yading@11:             ast->codec->extradata = av_mallocz(4 + FF_INPUT_BUFFER_PADDING_SIZE);
yading@11:             if (!ast->codec->extradata)
yading@11:                 return AVERROR(ENOMEM);
yading@11:             ast->codec->extradata_size = 4;
yading@11:             AV_WL32(ast->codec->extradata, vst->codec->codec_tag);
yading@11:         }
yading@11: 
yading@11:         for (i = 0; i < bink->num_audio_tracks; i++)
yading@11:             s->streams[i + 1]->id = avio_rl32(pb);
yading@11:     }
yading@11: 
yading@11:     /* frame index table */
yading@11:     next_pos = avio_rl32(pb);
yading@11:     for (i = 0; i < vst->duration; i++) {
yading@11:         pos = next_pos;
yading@11:         if (i == vst->duration - 1) {
yading@11:             next_pos = bink->file_size;
yading@11:             keyframe = 0;
yading@11:         } else {
yading@11:             next_pos = avio_rl32(pb);
yading@11:             keyframe = pos & 1;
yading@11:         }
yading@11:         pos &= ~1;
yading@11:         next_pos &= ~1;
yading@11: 
yading@11:         if (next_pos <= pos) {
yading@11:             av_log(s, AV_LOG_ERROR, "invalid frame index table\n");
yading@11:             return AVERROR(EIO);
yading@11:         }
yading@11:         av_add_index_entry(vst, pos, i, next_pos - pos, 0,
yading@11:                            keyframe ? AVINDEX_KEYFRAME : 0);
yading@11:     }
yading@11: 
yading@11:     avio_skip(pb, 4);
yading@11: 
yading@11:     bink->current_track = -1;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int read_packet(AVFormatContext *s, AVPacket *pkt)
yading@11: {
yading@11:     BinkDemuxContext *bink = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     int ret;
yading@11: 
yading@11:     if (bink->current_track < 0) {
yading@11:         int index_entry;
yading@11:         AVStream *st = s->streams[0]; // stream 0 is video stream with index
yading@11: 
yading@11:         if (bink->video_pts >= st->duration)
yading@11:             return AVERROR_EOF;
yading@11: 
yading@11:         index_entry = av_index_search_timestamp(st, bink->video_pts,
yading@11:                                                 AVSEEK_FLAG_ANY);
yading@11:         if (index_entry < 0) {
yading@11:             av_log(s, AV_LOG_ERROR,
yading@11:                    "could not find index entry for frame %"PRId64"\n",
yading@11:                    bink->video_pts);
yading@11:             return AVERROR(EIO);
yading@11:         }
yading@11: 
yading@11:         bink->remain_packet_size = st->index_entries[index_entry].size;
yading@11:         bink->current_track = 0;
yading@11:     }
yading@11: 
yading@11:     while (bink->current_track < bink->num_audio_tracks) {
yading@11:         uint32_t audio_size = avio_rl32(pb);
yading@11:         if (audio_size > bink->remain_packet_size - 4) {
yading@11:             av_log(s, AV_LOG_ERROR,
yading@11:                    "frame %"PRId64": audio size in header (%u) > size of packet left (%u)\n",
yading@11:                    bink->video_pts, audio_size, bink->remain_packet_size);
yading@11:             return AVERROR(EIO);
yading@11:         }
yading@11:         bink->remain_packet_size -= 4 + audio_size;
yading@11:         bink->current_track++;
yading@11:         if (audio_size >= 4) {
yading@11:             /* get one audio packet per track */
yading@11:             if ((ret = av_get_packet(pb, pkt, audio_size)) < 0)
yading@11:                 return ret;
yading@11:             pkt->stream_index = bink->current_track;
yading@11:             pkt->pts = bink->audio_pts[bink->current_track - 1];
yading@11: 
yading@11:             /* Each audio packet reports the number of decompressed samples
yading@11:                (in bytes). We use this value to calcuate the audio PTS */
yading@11:             if (pkt->size >= 4)
yading@11:                 bink->audio_pts[bink->current_track -1] +=
yading@11:                     AV_RL32(pkt->data) / (2 * s->streams[bink->current_track]->codec->channels);
yading@11:             return 0;
yading@11:         } else {
yading@11:             avio_skip(pb, audio_size);
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     /* get video packet */
yading@11:     if ((ret = av_get_packet(pb, pkt, bink->remain_packet_size)) < 0)
yading@11:         return ret;
yading@11:     pkt->stream_index = 0;
yading@11:     pkt->pts = bink->video_pts++;
yading@11:     pkt->flags |= AV_PKT_FLAG_KEY;
yading@11: 
yading@11:     /* -1 instructs the next call to read_packet() to read the next frame */
yading@11:     bink->current_track = -1;
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
yading@11: {
yading@11:     BinkDemuxContext *bink = s->priv_data;
yading@11:     AVStream *vst = s->streams[0];
yading@11: 
yading@11:     if (!s->pb->seekable)
yading@11:         return -1;
yading@11: 
yading@11:     /* seek to the first frame */
yading@11:     if (avio_seek(s->pb, vst->index_entries[0].pos, SEEK_SET) < 0)
yading@11:         return -1;
yading@11: 
yading@11:     bink->video_pts = 0;
yading@11:     memset(bink->audio_pts, 0, sizeof(bink->audio_pts));
yading@11:     bink->current_track = -1;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_bink_demuxer = {
yading@11:     .name           = "bink",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("Bink"),
yading@11:     .priv_data_size = sizeof(BinkDemuxContext),
yading@11:     .read_probe     = probe,
yading@11:     .read_header    = read_header,
yading@11:     .read_packet    = read_packet,
yading@11:     .read_seek      = read_seek,
yading@11: };