libavformat/pmpdec.c

   1 /*
   2  * PMP demuxer
   3  * Copyright (c) 2011 Reimar Döffinger
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * Libav is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with Libav; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "libavutil/intreadwrite.h"
  23 #include "avformat.h"
  24 #include "internal.h"
  25
  26 typedef struct PMPContext {
  27     int       cur_stream;
  28     int       num_streams;
  29     int       audio_packets;
  30     int       current_packet;
  31     uint32_t *packet_sizes;
  32     int       packet_sizes_alloc;
  33 } PMPContext;
  34
  35 static int pmp_probe(AVProbeData *p)
  36 {
  37     if (!memcmp(p->buf, "pmpm\1\0\0\0", 8))
  38         return AVPROBE_SCORE_MAX;
  39     return 0;
  40 }
  41
  42 static int pmp_header(AVFormatContext *s)
  43 {
  44     PMPContext *pmp = s->priv_data;
  45     AVIOContext *pb = s->pb;
  46     int tb_num, tb_den;
  47     int index_cnt;
  48     int audio_codec_id = AV_CODEC_ID_NONE;
  49     int srate, channels;
  50     int i;
  51     uint64_t pos;
  52     AVStream *vst = avformat_new_stream(s, NULL);
  53     if (!vst)
  54         return AVERROR(ENOMEM);
  55     vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
  56     avio_skip(pb, 8);
  57     switch (avio_rl32(pb)) {
  58     case 0:
  59         vst->codec->codec_id = AV_CODEC_ID_MPEG4;
  60         break;
  61     case 1:
  62         vst->codec->codec_id = AV_CODEC_ID_H264;
  63         break;
  64     default:
  65         av_log(s, AV_LOG_ERROR, "Unsupported video format\n");
  66         break;
  67     }
  68     index_cnt          = avio_rl32(pb);
  69     vst->codec->width  = avio_rl32(pb);
  70     vst->codec->height = avio_rl32(pb);
  71
  72     tb_num = avio_rl32(pb);
  73     tb_den = avio_rl32(pb);
  74     avpriv_set_pts_info(vst, 32, tb_num, tb_den);
  75     vst->nb_frames = index_cnt;
  76     vst->duration  = index_cnt;
  77
  78     switch (avio_rl32(pb)) {
  79     case 0:
  80         audio_codec_id = AV_CODEC_ID_MP3;
  81         break;
  82     case 1:
  83         av_log(s, AV_LOG_WARNING, "AAC is not yet correctly supported\n");
  84         audio_codec_id = AV_CODEC_ID_AAC;
  85         break;
  86     default:
  87         av_log(s, AV_LOG_ERROR, "Unsupported audio format\n");
  88         break;
  89     }
  90     pmp->num_streams = avio_rl16(pb) + 1;
  91     avio_skip(pb, 10);
  92     srate    = avio_rl32(pb);
  93     channels = avio_rl32(pb) + 1;
  94     for (i = 1; i < pmp->num_streams; i++) {
  95         AVStream *ast = avformat_new_stream(s, NULL);
  96         if (!ast)
  97             return AVERROR(ENOMEM);
  98         ast->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
  99         ast->codec->codec_id    = audio_codec_id;
 100         ast->codec->channels    = channels;
 101         ast->codec->sample_rate = srate;
 102         avpriv_set_pts_info(ast, 32, 1, srate);
 103     }
 104     pos = avio_tell(pb) + 4 * index_cnt;
 105     for (i = 0; i < index_cnt; i++) {
 106         int size  = avio_rl32(pb);
 107         int flags = size & 1 ? AVINDEX_KEYFRAME : 0;
 108         size >>= 1;
 109         av_add_index_entry(vst, pos, i, size, 0, flags);
 110         pos += size;
 111     }
 112     return 0;
 113 }
 114
 115 static int pmp_packet(AVFormatContext *s, AVPacket *pkt)
 116 {
 117     PMPContext *pmp = s->priv_data;
 118     AVIOContext *pb = s->pb;
 119     int ret = 0;
 120     int i;
 121
 122     if (pb->eof_reached)
 123         return AVERROR_EOF;
 124     if (pmp->cur_stream == 0) {
 125         int num_packets;
 126         pmp->audio_packets = avio_r8(pb);
 127         if (!pmp->audio_packets) {
 128             av_log(s, AV_LOG_ERROR, "No audio packets.\n");
 129             return AVERROR_INVALIDDATA;
 130         }
 131
 132         num_packets = (pmp->num_streams - 1) * pmp->audio_packets + 1;
 133         avio_skip(pb, 8);
 134         pmp->current_packet = 0;
 135         av_fast_malloc(&pmp->packet_sizes,
 136                        &pmp->packet_sizes_alloc,
 137                        num_packets * sizeof(*pmp->packet_sizes));
 138         if (!pmp->packet_sizes_alloc) {
 139             av_log(s, AV_LOG_ERROR, "Cannot (re)allocate packet buffer\n");
 140             return AVERROR(ENOMEM);
 141         }
 142         for (i = 0; i < num_packets; i++)
 143             pmp->packet_sizes[i] = avio_rl32(pb);
 144     }
 145     ret = av_get_packet(pb, pkt, pmp->packet_sizes[pmp->current_packet]);
 146     if (ret > 0) {
 147         ret = 0;
 148         // FIXME: this is a hack that should be removed once
 149         // compute_pkt_fields() can handle timestamps properly
 150         if (pmp->cur_stream == 0)
 151             pkt->dts = s->streams[0]->cur_dts++;
 152         pkt->stream_index = pmp->cur_stream;
 153     }
 154     pmp->current_packet++;
 155     if (pmp->current_packet == 1 || pmp->current_packet > pmp->audio_packets)
 156         pmp->cur_stream = (pmp->cur_stream + 1) % pmp->num_streams;
 157
 158     return ret;
 159 }
 160
 161 static int pmp_seek(AVFormatContext *s, int stream_idx, int64_t ts, int flags)
 162 {
 163     PMPContext *pmp = s->priv_data;
 164     pmp->cur_stream = 0;
 165     // fall back on default seek now
 166     return -1;
 167 }
 168
 169 static int pmp_close(AVFormatContext *s)
 170 {
 171     PMPContext *pmp = s->priv_data;
 172     av_freep(&pmp->packet_sizes);
 173     return 0;
 174 }
 175
 176 AVInputFormat ff_pmp_demuxer = {
 177     .name           = "pmp",
 178     .long_name      = NULL_IF_CONFIG_SMALL("Playstation Portable PMP"),
 179     .priv_data_size = sizeof(PMPContext),
 180     .read_probe     = pmp_probe,
 181     .read_header    = pmp_header,
 182     .read_packet    = pmp_packet,
 183     .read_seek      = pmp_seek,
 184     .read_close     = pmp_close,
 185 };