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ffmpeg / libavformat / bink.c @ 2912e87a

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/*
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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/intreadwrite.h"
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#include "avformat.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, AVFormatParameters *ap)
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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 = av_new_stream(s, 0);
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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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    av_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   = 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 = av_new_stream(s, 1);
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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   = vst->codec->codec_tag;
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            ast->codec->sample_rate = avio_rl16(pb);
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            av_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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                                   CODEC_ID_BINKAUDIO_DCT : CODEC_ID_BINKAUDIO_RDFT;
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            ast->codec->channels = flags & BINK_AUD_STEREO ? 2 : 1;
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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 (url_is_streamed(s->pb))
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        return -1;
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    /* seek to the first frame */
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    avio_seek(s->pb, vst->index_entries[0].pos, SEEK_SET);
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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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    "bink",
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    NULL_IF_CONFIG_SMALL("Bink"),
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    sizeof(BinkDemuxContext),
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    probe,
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    read_header,
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    read_packet,
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    NULL,
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    read_seek,
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};