libavformat/pmpdec.c

   1 /*
   2  * PMP demuxer.
   3  * Copyright (c) 2011 Reimar Döffinger
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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 "libavutil/mem.h"
  24 #include "avformat.h"
  25 #include "demux.h"
  26 #include "internal.h"
  27
  28 typedef struct {
  29     int cur_stream;
  30     int num_streams;
  31     int audio_packets;
  32     int current_packet;
  33     uint32_t *packet_sizes;
  34     int packet_sizes_alloc;
  35 } PMPContext;
  36
  37 static int pmp_probe(const AVProbeData *p) {
  38     if (AV_RN32(p->buf) == AV_RN32("pmpm") &&
  39         AV_RL32(p->buf + 4) == 1)
  40         return AVPROBE_SCORE_MAX;
  41     return 0;
  42 }
  43
  44 static int pmp_header(AVFormatContext *s)
  45 {
  46     PMPContext *pmp = s->priv_data;
  47     AVIOContext *pb = s->pb;
  48     int tb_num, tb_den;
  49     uint32_t index_cnt;
  50     int audio_codec_id = AV_CODEC_ID_NONE;
  51     int srate, channels;
  52     unsigned i;
  53     uint64_t pos;
  54     int64_t fsize = avio_size(pb);
  55
  56     AVStream *vst = avformat_new_stream(s, NULL);
  57     if (!vst)
  58         return AVERROR(ENOMEM);
  59     vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
  60     avio_skip(pb, 8);
  61     switch (avio_rl32(pb)) {
  62     case 0:
  63         vst->codecpar->codec_id = AV_CODEC_ID_MPEG4;
  64         break;
  65     case 1:
  66         vst->codecpar->codec_id = AV_CODEC_ID_H264;
  67         break;
  68     default:
  69         av_log(s, AV_LOG_ERROR, "Unsupported video format\n");
  70         break;
  71     }
  72     index_cnt          = avio_rl32(pb);
  73     vst->codecpar->width  = avio_rl32(pb);
  74     vst->codecpar->height = avio_rl32(pb);
  75
  76     tb_num = avio_rl32(pb);
  77     tb_den = avio_rl32(pb);
  78     avpriv_set_pts_info(vst, 32, tb_num, tb_den);
  79     vst->nb_frames = index_cnt;
  80     vst->duration = index_cnt;
  81
  82     switch (avio_rl32(pb)) {
  83     case 0:
  84         audio_codec_id = AV_CODEC_ID_MP3;
  85         break;
  86     case 1:
  87         av_log(s, AV_LOG_ERROR, "AAC not yet correctly supported\n");
  88         audio_codec_id = AV_CODEC_ID_AAC;
  89         break;
  90     default:
  91         av_log(s, AV_LOG_ERROR, "Unsupported audio format\n");
  92         break;
  93     }
  94     pmp->num_streams = avio_rl16(pb) + 1;
  95     avio_skip(pb, 10);
  96     srate = avio_rl32(pb);
  97     channels = avio_rl32(pb) + 1;
  98     pos = avio_tell(pb) + 4LL*index_cnt;
  99     for (i = 0; i < index_cnt; i++) {
 100         uint32_t size = avio_rl32(pb);
 101         int flags = size & 1 ? AVINDEX_KEYFRAME : 0;
 102         if (avio_feof(pb)) {
 103             av_log(s, AV_LOG_FATAL, "Encountered EOF while reading index.\n");
 104             return AVERROR_INVALIDDATA;
 105         }
 106         size >>= 1;
 107         if (size < 9 + 4*pmp->num_streams) {
 108             av_log(s, AV_LOG_ERROR, "Packet too small\n");
 109             return AVERROR_INVALIDDATA;
 110         }
 111         av_add_index_entry(vst, pos, i, size, 0, flags);
 112         pos += size;
 113         if (fsize > 0 && i == 0 && pos > fsize) {
 114             av_log(s, AV_LOG_ERROR, "File ends before first packet\n");
 115             return AVERROR_INVALIDDATA;
 116         }
 117     }
 118     for (i = 1; i < pmp->num_streams; i++) {
 119         AVStream *ast = avformat_new_stream(s, NULL);
 120         if (!ast)
 121             return AVERROR(ENOMEM);
 122         ast->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;
 123         ast->codecpar->codec_id    = audio_codec_id;
 124         ast->codecpar->ch_layout.nb_channels = channels;
 125         ast->codecpar->sample_rate = srate;
 126         avpriv_set_pts_info(ast, 32, 1, srate);
 127     }
 128     return 0;
 129 }
 130
 131 static int pmp_packet(AVFormatContext *s, AVPacket *pkt)
 132 {
 133     PMPContext *pmp = s->priv_data;
 134     AVIOContext *pb = s->pb;
 135     int ret = 0;
 136     int i;
 137
 138     if (avio_feof(pb))
 139         return AVERROR_EOF;
 140     if (pmp->cur_stream == 0) {
 141         int num_packets;
 142         pmp->audio_packets = avio_r8(pb);
 143
 144         if (!pmp->audio_packets) {
 145             av_log(s, AV_LOG_ERROR, "No audio packets.\n");
 146             return AVERROR_INVALIDDATA;
 147         }
 148
 149         num_packets = (pmp->num_streams - 1) * pmp->audio_packets + 1;
 150         avio_skip(pb, 8);
 151         pmp->current_packet = 0;
 152         av_fast_malloc(&pmp->packet_sizes,
 153                        &pmp->packet_sizes_alloc,
 154                        num_packets * sizeof(*pmp->packet_sizes));
 155         if (!pmp->packet_sizes_alloc) {
 156             av_log(s, AV_LOG_ERROR, "Cannot (re)allocate packet buffer\n");
 157             return AVERROR(ENOMEM);
 158         }
 159         for (i = 0; i < num_packets; i++)
 160             pmp->packet_sizes[i] = avio_rl32(pb);
 161     }
 162     ret = av_get_packet(pb, pkt, pmp->packet_sizes[pmp->current_packet]);
 163     if (ret >= 0) {
 164         ret = 0;
 165         pkt->stream_index = pmp->cur_stream;
 166     }
 167     if (pmp->current_packet % pmp->audio_packets == 0)
 168         pmp->cur_stream = (pmp->cur_stream + 1) % pmp->num_streams;
 169     pmp->current_packet++;
 170     return ret;
 171 }
 172
 173 static int pmp_seek(AVFormatContext *s, int stream_index, int64_t ts, int flags)
 174 {
 175     PMPContext *pmp = s->priv_data;
 176     pmp->cur_stream = 0;
 177     // fall back on default seek now
 178     return -1;
 179 }
 180
 181 static int pmp_close(AVFormatContext *s)
 182 {
 183     PMPContext *pmp = s->priv_data;
 184     av_freep(&pmp->packet_sizes);
 185     return 0;
 186 }
 187
 188 const FFInputFormat ff_pmp_demuxer = {
 189     .p.name         = "pmp",
 190     .p.long_name    = NULL_IF_CONFIG_SMALL("Playstation Portable PMP"),
 191     .priv_data_size = sizeof(PMPContext),
 192     .read_probe     = pmp_probe,
 193     .read_header    = pmp_header,
 194     .read_packet    = pmp_packet,
 195     .read_seek      = pmp_seek,
 196     .read_close     = pmp_close,
 197 };