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libavformat/pmpdec.c

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00001 /*
00002  * PMP demuxer.
00003  * Copyright (c) 2011 Reimar Döffinger
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 #include "libavutil/intreadwrite.h"
00023 #include "avformat.h"
00024 
00025 typedef struct {
00026     int cur_stream;
00027     int num_streams;
00028     int audio_packets;
00029     int current_packet;
00030     uint32_t *packet_sizes;
00031     int packet_sizes_alloc;
00032 } PMPContext;
00033 
00034 static int pmp_probe(AVProbeData *p) {
00035     if (AV_RN32(p->buf) == AV_RN32("pmpm") &&
00036         AV_RL32(p->buf + 4) == 1)
00037         return AVPROBE_SCORE_MAX;
00038     return 0;
00039 }
00040 
00041 static int pmp_header(AVFormatContext *s, AVFormatParameters *ap) {
00042     PMPContext *pmp = s->priv_data;
00043     AVIOContext *pb = s->pb;
00044     int tb_num, tb_den;
00045     int index_cnt;
00046     int audio_codec_id = CODEC_ID_NONE;
00047     int srate, channels;
00048     int i;
00049     uint64_t pos;
00050     AVStream *vst = av_new_stream(s, 0);
00051     if (!vst)
00052         return AVERROR(ENOMEM);
00053     vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00054     avio_skip(pb, 8);
00055     switch (avio_rl32(pb)) {
00056     case 0:
00057         vst->codec->codec_id = CODEC_ID_MPEG4;
00058         break;
00059     case 1:
00060         vst->codec->codec_id = CODEC_ID_H264;
00061         break;
00062     default:
00063         av_log(s, AV_LOG_ERROR, "Unsupported video format\n");
00064         break;
00065     }
00066     index_cnt = avio_rl32(pb);
00067     vst->codec->width  = avio_rl32(pb);
00068     vst->codec->height = avio_rl32(pb);
00069 
00070     tb_num = avio_rl32(pb);
00071     tb_den = avio_rl32(pb);
00072     av_set_pts_info(vst, 32, tb_num, tb_den);
00073     vst->nb_frames = index_cnt;
00074     vst->duration = index_cnt;
00075 
00076     switch (avio_rl32(pb)) {
00077     case 0:
00078         audio_codec_id = CODEC_ID_MP3;
00079         break;
00080     case 1:
00081         av_log(s, AV_LOG_ERROR, "AAC not yet correctly supported\n");
00082         audio_codec_id = CODEC_ID_AAC;
00083         break;
00084     default:
00085         av_log(s, AV_LOG_ERROR, "Unsupported audio format\n");
00086         break;
00087     }
00088     pmp->num_streams = avio_rl16(pb) + 1;
00089     avio_skip(pb, 10);
00090     srate = avio_rl32(pb);
00091     channels = avio_rl32(pb) + 1;
00092     for (i = 1; i < pmp->num_streams; i++) {
00093         AVStream *ast = av_new_stream(s, i);
00094         if (!ast)
00095             return AVERROR(ENOMEM);
00096         ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00097         ast->codec->codec_id = audio_codec_id;
00098         ast->codec->channels = channels;
00099         ast->codec->sample_rate = srate;
00100         av_set_pts_info(ast, 32, 1, srate);
00101     }
00102     pos = avio_tell(pb) + 4*index_cnt;
00103     for (i = 0; i < index_cnt; i++) {
00104         int size = avio_rl32(pb);
00105         int flags = size & 1 ? AVINDEX_KEYFRAME : 0;
00106         size >>= 1;
00107         av_add_index_entry(vst, pos, i, size, 0, flags);
00108         pos += size;
00109     }
00110     return 0;
00111 }
00112 
00113 static int pmp_packet(AVFormatContext *s, AVPacket *pkt) {
00114     PMPContext *pmp = s->priv_data;
00115     AVIOContext *pb = s->pb;
00116     int ret = 0;
00117     int i;
00118 
00119     if (url_feof(pb))
00120         return AVERROR_EOF;
00121     if (pmp->cur_stream == 0) {
00122         int num_packets;
00123         pmp->audio_packets = avio_r8(pb);
00124         num_packets = (pmp->num_streams - 1) * pmp->audio_packets + 1;
00125         avio_skip(pb, 8);
00126         pmp->current_packet = 0;
00127         av_fast_malloc(&pmp->packet_sizes,
00128                        &pmp->packet_sizes_alloc,
00129                        num_packets * sizeof(*pmp->packet_sizes));
00130         for (i = 0; i < num_packets; i++)
00131             pmp->packet_sizes[i] = avio_rl32(pb);
00132     }
00133     ret = av_get_packet(pb, pkt, pmp->packet_sizes[pmp->current_packet]);
00134     if (ret >= 0) {
00135         ret = 0;
00136         // FIXME: this is a hack that should be remove once
00137         // compute_pkt_fields can handle
00138         if (pmp->cur_stream == 0)
00139             pkt->dts = s->streams[0]->cur_dts++;
00140         pkt->stream_index = pmp->cur_stream;
00141     }
00142     if (pmp->current_packet % pmp->audio_packets == 0)
00143         pmp->cur_stream = (pmp->cur_stream + 1) % pmp->num_streams;
00144     pmp->current_packet++;
00145     return ret;
00146 }
00147 
00148 static int pmp_seek(AVFormatContext *s, int stream_index,
00149                      int64_t ts, int flags) {
00150     PMPContext *pmp = s->priv_data;
00151     pmp->cur_stream = 0;
00152     // fallback to default seek now
00153     return -1;
00154 }
00155 
00156 static int pmp_close(AVFormatContext *s)
00157 {
00158     PMPContext *pmp = s->priv_data;
00159     av_freep(&pmp->packet_sizes);
00160     return 0;
00161 }
00162 
00163 AVInputFormat ff_pmp_demuxer = {
00164     .name           = "pmp",
00165     .long_name      = NULL_IF_CONFIG_SMALL("Playstation Portable PMP format"),
00166     .priv_data_size = sizeof(PMPContext),
00167     .read_probe     = pmp_probe,
00168     .read_header    = pmp_header,
00169     .read_packet    = pmp_packet,
00170     .read_seek      = pmp_seek,
00171     .read_close     = pmp_close,
00172 };

Generated on Fri Feb 22 2013 07:24:31 for FFmpeg by  doxygen 1.7.1