mirror of https://github.com/FFmpeg/FFmpeg.git
Peter Ross
14 years ago
committed by
Ronald S. Bultje
parent
0697440c1e
commit
bfaefd87dc
4 changed files with 224 additions and 1 deletions
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/*
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* Bitmap Brothers JV demuxer |
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* Copyright (c) 2005, 2011 Peter Ross <pross@xvid.org> |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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* Bitmap Brothers JV demuxer |
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* @author Peter Ross <pross@xvid.org> |
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*/ |
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#include "libavutil/intreadwrite.h" |
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#include "avformat.h" |
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typedef struct { |
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int audio_size; /** audio packet size (bytes) */ |
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int video_size; /** video packet size (bytes) */ |
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int palette; /** frame contains palette change */ |
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int video_type; /** per-frame video compression type */ |
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} JVFrame; |
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typedef struct { |
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JVFrame *frames; |
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enum { |
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JV_AUDIO = 0, |
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JV_VIDEO, |
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JV_PADDING |
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} state; |
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int64_t pts; |
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} JVDemuxContext; |
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#define MAGIC " Compression by John M Phillips Copyright (C) 1995 The Bitmap Brothers Ltd." |
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static int read_probe(AVProbeData *pd) |
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{ |
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if (pd->buf[0] == 'J' && pd->buf[1] == 'V' && |
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!memcmp(pd->buf + 4, MAGIC, FFMIN(strlen(MAGIC), pd->buf_size - 4))) |
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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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AVFormatParameters *ap) |
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{ |
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JVDemuxContext *jv = s->priv_data; |
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AVIOContext *pb = s->pb; |
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AVStream *vst, *ast; |
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int64_t audio_pts = 0; |
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int64_t offset; |
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int i; |
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avio_skip(pb, 80); |
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ast = av_new_stream(s, 0); |
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vst = av_new_stream(s, 1); |
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if (!ast || !vst) |
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return AVERROR(ENOMEM); |
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vst->codec->codec_type = CODEC_TYPE_VIDEO; |
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vst->codec->codec_id = CODEC_ID_JV; |
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vst->codec->codec_tag = 0; /* no fourcc */ |
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vst->codec->width = avio_rl16(pb); |
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vst->codec->height = avio_rl16(pb); |
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vst->nb_frames = |
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ast->nb_index_entries = avio_rl16(pb); |
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av_set_pts_info(vst, 64, avio_rl16(pb), 1000); |
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avio_skip(pb, 4); |
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ast->codec->codec_type = CODEC_TYPE_AUDIO; |
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ast->codec->codec_id = CODEC_ID_PCM_U8; |
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ast->codec->codec_tag = 0; /* no fourcc */ |
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ast->codec->sample_rate = avio_rl16(pb); |
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ast->codec->channels = 1; |
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av_set_pts_info(ast, 64, 1, ast->codec->sample_rate); |
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avio_skip(pb, 10); |
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ast->index_entries = av_malloc(ast->nb_index_entries * sizeof(*ast->index_entries)); |
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if (!ast->index_entries) |
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return AVERROR(ENOMEM); |
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jv->frames = av_malloc(ast->nb_index_entries * sizeof(JVFrame)); |
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if (!jv->frames) |
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return AVERROR(ENOMEM); |
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offset = 0x68 + ast->nb_index_entries * 16; |
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for(i = 0; i < ast->nb_index_entries; i++) { |
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AVIndexEntry *e = ast->index_entries + i; |
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JVFrame *jvf = jv->frames + i; |
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/* total frame size including audio, video, palette data and padding */ |
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e->size = avio_rl32(pb); |
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e->timestamp = i; |
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e->pos = offset; |
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offset += e->size; |
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jvf->audio_size = avio_rl32(pb); |
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jvf->video_size = avio_rl32(pb); |
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jvf->palette = avio_r8(pb); |
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if (avio_r8(pb)) |
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av_log(s, AV_LOG_WARNING, "unsupported audio codec\n"); |
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jvf->video_type = avio_r8(pb); |
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avio_skip(pb, 1); |
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e->timestamp = jvf->audio_size ? audio_pts : AV_NOPTS_VALUE; |
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audio_pts += jvf->audio_size; |
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e->flags = jvf->video_type != 1 ? AVINDEX_KEYFRAME : 0; |
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} |
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jv->state = JV_AUDIO; |
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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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JVDemuxContext *jv = s->priv_data; |
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AVIOContext *pb = s->pb; |
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AVStream *ast = s->streams[0]; |
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while (!url_feof(s->pb) && jv->pts < ast->nb_index_entries) { |
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const AVIndexEntry *e = ast->index_entries + jv->pts; |
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const JVFrame *jvf = jv->frames + jv->pts; |
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switch(jv->state) { |
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case JV_AUDIO: |
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jv->state++; |
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if (jvf->audio_size ) { |
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if (av_get_packet(s->pb, pkt, jvf->audio_size) < 0) |
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return AVERROR(ENOMEM); |
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pkt->stream_index = 0; |
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pkt->pts = e->timestamp; |
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pkt->flags |= PKT_FLAG_KEY; |
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return 0; |
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} |
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case JV_VIDEO: |
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jv->state++; |
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if (jvf->video_size || jvf->palette) { |
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int size = jvf->video_size + (jvf->palette ? 768 : 0); |
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if (av_new_packet(pkt, size + 5)) |
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return AVERROR(ENOMEM); |
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AV_WL32(pkt->data, jvf->video_size); |
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pkt->data[4] = jvf->video_type; |
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if (avio_read(pb, pkt->data + 5, size) < 0) |
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return AVERROR(EIO); |
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pkt->size = size + 5; |
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pkt->stream_index = 1; |
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pkt->pts = jv->pts; |
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if (jvf->video_type != 1) |
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pkt->flags |= PKT_FLAG_KEY; |
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return 0; |
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} |
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case JV_PADDING: |
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avio_skip(pb, FFMAX(e->size - jvf->audio_size - jvf->video_size |
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- (jvf->palette ? 768 : 0), 0)); |
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jv->state = JV_AUDIO; |
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jv->pts++; |
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} |
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} |
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return AVERROR(EIO); |
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} |
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static int read_seek(AVFormatContext *s, int stream_index, |
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int64_t ts, int flags) |
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{ |
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JVDemuxContext *jv = s->priv_data; |
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AVStream *ast = s->streams[0]; |
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int i; |
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if (flags & (AVSEEK_FLAG_BYTE|AVSEEK_FLAG_FRAME)) |
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return AVERROR_NOTSUPP; |
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switch(stream_index) { |
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case 0: |
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i = av_index_search_timestamp(ast, ts, flags); |
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break; |
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case 1: |
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i = ts; |
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break; |
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default: |
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return 0; |
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} |
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if (i < 0 || i >= ast->nb_index_entries) |
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return 0; |
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jv->state = JV_AUDIO; |
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jv->pts = i; |
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avio_seek(s->pb, ast->index_entries[i].pos, SEEK_SET); |
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return 0; |
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} |
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AVInputFormat ff_jv_demuxer = { |
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.name = "jv", |
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.long_name = NULL_IF_CONFIG_SMALL("Bitmap Brothers JV"), |
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.priv_data_size = sizeof(JVDemuxContext), |
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.read_probe = read_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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