240 lines
7.1 KiB
C
240 lines
7.1 KiB
C
/*
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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/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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#define JV_PREAMBLE_SIZE 5
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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_size; /**< palette size (bytes) */
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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' && strlen(MAGIC) <= pd->buf_size - 4 &&
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!memcmp(pd->buf + 4, MAGIC, strlen(MAGIC)))
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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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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 = avformat_new_stream(s, NULL);
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vst = avformat_new_stream(s, NULL);
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if (!ast || !vst)
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return AVERROR(ENOMEM);
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vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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vst->codec->codec_id = AV_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->duration =
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vst->nb_frames =
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ast->nb_index_entries = avio_rl16(pb);
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avpriv_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 = AVMEDIA_TYPE_AUDIO;
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ast->codec->codec_id = AV_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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ast->codec->channel_layout = AV_CH_LAYOUT_MONO;
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avpriv_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_size = avio_r8(pb) ? 768 : 0;
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jvf->video_size = FFMIN(FFMAX(jvf->video_size, 0),
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INT_MAX - JV_PREAMBLE_SIZE - jvf->palette_size);
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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 |= AV_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_size) {
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int size = jvf->video_size + jvf->palette_size;
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if (av_new_packet(pkt, size + JV_PREAMBLE_SIZE))
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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 ((size = avio_read(pb, pkt->data + JV_PREAMBLE_SIZE, size)) < 0)
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return AVERROR(EIO);
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pkt->size = size + JV_PREAMBLE_SIZE;
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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 |= AV_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_size, 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(ENOSYS);
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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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if (avio_seek(s->pb, ast->index_entries[i].pos, SEEK_SET) < 0)
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return -1;
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jv->state = JV_AUDIO;
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jv->pts = i;
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return 0;
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}
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static int read_close(AVFormatContext *s)
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{
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JVDemuxContext *jv = s->priv_data;
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av_freep(&jv->frames);
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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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.read_close = read_close,
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};
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