yading@11: /* yading@11: * Bitmap Brothers JV demuxer yading@11: * Copyright (c) 2005, 2011 Peter Ross 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: * Bitmap Brothers JV demuxer yading@11: * @author Peter Ross 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: #define JV_PREAMBLE_SIZE 5 yading@11: yading@11: typedef struct { yading@11: int audio_size; /** audio packet size (bytes) */ yading@11: int video_size; /** video packet size (bytes) */ yading@11: int palette_size; /** palette size (bytes) */ yading@11: int video_type; /** per-frame video compression type */ yading@11: } JVFrame; yading@11: yading@11: typedef struct { yading@11: JVFrame *frames; yading@11: enum { yading@11: JV_AUDIO = 0, yading@11: JV_VIDEO, yading@11: JV_PADDING yading@11: } state; yading@11: int64_t pts; yading@11: } JVDemuxContext; yading@11: yading@11: #define MAGIC " Compression by John M Phillips Copyright (C) 1995 The Bitmap Brothers Ltd." yading@11: yading@11: static int read_probe(AVProbeData *pd) yading@11: { yading@11: if (pd->buf[0] == 'J' && pd->buf[1] == 'V' && strlen(MAGIC) <= pd->buf_size - 4 && yading@11: !memcmp(pd->buf + 4, MAGIC, strlen(MAGIC))) 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: JVDemuxContext *jv = s->priv_data; yading@11: AVIOContext *pb = s->pb; yading@11: AVStream *vst, *ast; yading@11: int64_t audio_pts = 0; yading@11: int64_t offset; yading@11: int i; yading@11: yading@11: avio_skip(pb, 80); yading@11: yading@11: ast = avformat_new_stream(s, NULL); yading@11: vst = avformat_new_stream(s, NULL); yading@11: if (!ast || !vst) yading@11: return AVERROR(ENOMEM); yading@11: yading@11: vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; yading@11: vst->codec->codec_id = AV_CODEC_ID_JV; yading@11: vst->codec->codec_tag = 0; /* no fourcc */ yading@11: vst->codec->width = avio_rl16(pb); yading@11: vst->codec->height = avio_rl16(pb); yading@11: vst->duration = yading@11: vst->nb_frames = yading@11: ast->nb_index_entries = avio_rl16(pb); yading@11: avpriv_set_pts_info(vst, 64, avio_rl16(pb), 1000); yading@11: yading@11: avio_skip(pb, 4); yading@11: yading@11: ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; yading@11: ast->codec->codec_id = AV_CODEC_ID_PCM_U8; yading@11: ast->codec->codec_tag = 0; /* no fourcc */ yading@11: ast->codec->sample_rate = avio_rl16(pb); yading@11: ast->codec->channels = 1; yading@11: ast->codec->channel_layout = AV_CH_LAYOUT_MONO; yading@11: avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate); yading@11: yading@11: avio_skip(pb, 10); yading@11: yading@11: ast->index_entries = av_malloc(ast->nb_index_entries * sizeof(*ast->index_entries)); yading@11: if (!ast->index_entries) yading@11: return AVERROR(ENOMEM); yading@11: yading@11: jv->frames = av_malloc(ast->nb_index_entries * sizeof(JVFrame)); yading@11: if (!jv->frames) yading@11: return AVERROR(ENOMEM); yading@11: yading@11: offset = 0x68 + ast->nb_index_entries * 16; yading@11: for(i = 0; i < ast->nb_index_entries; i++) { yading@11: AVIndexEntry *e = ast->index_entries + i; yading@11: JVFrame *jvf = jv->frames + i; yading@11: yading@11: /* total frame size including audio, video, palette data and padding */ yading@11: e->size = avio_rl32(pb); yading@11: e->timestamp = i; yading@11: e->pos = offset; yading@11: offset += e->size; yading@11: yading@11: jvf->audio_size = avio_rl32(pb); yading@11: jvf->video_size = avio_rl32(pb); yading@11: jvf->palette_size = avio_r8(pb) ? 768 : 0; yading@11: jvf->video_size = FFMIN(FFMAX(jvf->video_size, 0), yading@11: INT_MAX - JV_PREAMBLE_SIZE - jvf->palette_size); yading@11: if (avio_r8(pb)) yading@11: av_log(s, AV_LOG_WARNING, "unsupported audio codec\n"); yading@11: jvf->video_type = avio_r8(pb); yading@11: avio_skip(pb, 1); yading@11: yading@11: e->timestamp = jvf->audio_size ? audio_pts : AV_NOPTS_VALUE; yading@11: audio_pts += jvf->audio_size; yading@11: yading@11: e->flags = jvf->video_type != 1 ? AVINDEX_KEYFRAME : 0; yading@11: } yading@11: yading@11: jv->state = JV_AUDIO; yading@11: return 0; yading@11: } yading@11: yading@11: static int read_packet(AVFormatContext *s, AVPacket *pkt) yading@11: { yading@11: JVDemuxContext *jv = s->priv_data; yading@11: AVIOContext *pb = s->pb; yading@11: AVStream *ast = s->streams[0]; yading@11: yading@11: while (!url_feof(s->pb) && jv->pts < ast->nb_index_entries) { yading@11: const AVIndexEntry *e = ast->index_entries + jv->pts; yading@11: const JVFrame *jvf = jv->frames + jv->pts; yading@11: yading@11: switch(jv->state) { yading@11: case JV_AUDIO: yading@11: jv->state++; yading@11: if (jvf->audio_size ) { yading@11: if (av_get_packet(s->pb, pkt, jvf->audio_size) < 0) yading@11: return AVERROR(ENOMEM); yading@11: pkt->stream_index = 0; yading@11: pkt->pts = e->timestamp; yading@11: pkt->flags |= AV_PKT_FLAG_KEY; yading@11: return 0; yading@11: } yading@11: case JV_VIDEO: yading@11: jv->state++; yading@11: if (jvf->video_size || jvf->palette_size) { yading@11: int size = jvf->video_size + jvf->palette_size; yading@11: if (av_new_packet(pkt, size + JV_PREAMBLE_SIZE)) yading@11: return AVERROR(ENOMEM); yading@11: yading@11: AV_WL32(pkt->data, jvf->video_size); yading@11: pkt->data[4] = jvf->video_type; yading@11: if ((size = avio_read(pb, pkt->data + JV_PREAMBLE_SIZE, size)) < 0) yading@11: return AVERROR(EIO); yading@11: yading@11: pkt->size = size + JV_PREAMBLE_SIZE; yading@11: pkt->stream_index = 1; yading@11: pkt->pts = jv->pts; yading@11: if (jvf->video_type != 1) yading@11: pkt->flags |= AV_PKT_FLAG_KEY; yading@11: return 0; yading@11: } yading@11: case JV_PADDING: yading@11: avio_skip(pb, FFMAX(e->size - jvf->audio_size - jvf->video_size yading@11: - jvf->palette_size, 0)); yading@11: jv->state = JV_AUDIO; yading@11: jv->pts++; yading@11: } yading@11: } yading@11: yading@11: return AVERROR(EIO); yading@11: } yading@11: yading@11: static int read_seek(AVFormatContext *s, int stream_index, yading@11: int64_t ts, int flags) yading@11: { yading@11: JVDemuxContext *jv = s->priv_data; yading@11: AVStream *ast = s->streams[0]; yading@11: int i; yading@11: yading@11: if (flags & (AVSEEK_FLAG_BYTE|AVSEEK_FLAG_FRAME)) yading@11: return AVERROR(ENOSYS); yading@11: yading@11: switch(stream_index) { yading@11: case 0: yading@11: i = av_index_search_timestamp(ast, ts, flags); yading@11: break; yading@11: case 1: yading@11: i = ts; yading@11: break; yading@11: default: yading@11: return 0; yading@11: } yading@11: yading@11: if (i < 0 || i >= ast->nb_index_entries) yading@11: return 0; yading@11: if (avio_seek(s->pb, ast->index_entries[i].pos, SEEK_SET) < 0) yading@11: return -1; yading@11: yading@11: jv->state = JV_AUDIO; yading@11: jv->pts = i; yading@11: return 0; yading@11: } yading@11: yading@11: static int read_close(AVFormatContext *s) yading@11: { yading@11: JVDemuxContext *jv = s->priv_data; yading@11: yading@11: av_freep(&jv->frames); yading@11: yading@11: return 0; yading@11: } yading@11: yading@11: AVInputFormat ff_jv_demuxer = { yading@11: .name = "jv", yading@11: .long_name = NULL_IF_CONFIG_SMALL("Bitmap Brothers JV"), yading@11: .priv_data_size = sizeof(JVDemuxContext), yading@11: .read_probe = read_probe, yading@11: .read_header = read_header, yading@11: .read_packet = read_packet, yading@11: .read_seek = read_seek, yading@11: .read_close = read_close, yading@11: };