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pmpdec.c
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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 "avformat.h"
24 #include "internal.h"
25 
26 typedef struct {
31  uint32_t *packet_sizes;
33 } PMPContext;
34 
35 static int pmp_probe(AVProbeData *p) {
36  if (AV_RN32(p->buf) == AV_RN32("pmpm") &&
37  AV_RL32(p->buf + 4) == 1)
38  return AVPROBE_SCORE_MAX;
39  return 0;
40 }
41 
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;
53  if (!vst)
54  return AVERROR(ENOMEM);
56  avio_skip(pb, 8);
57  switch (avio_rl32(pb)) {
58  case 0:
60  break;
61  case 1:
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_ERROR, "AAC 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++) {
96  if (!ast)
97  return AVERROR(ENOMEM);
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 
116 {
117  PMPContext *pmp = s->priv_data;
118  AVIOContext *pb = s->pb;
119  int ret = 0;
120  int i;
121 
122  if (url_feof(pb))
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_ask_for_sample(s, "0 audio packets\n");
129  return AVERROR_PATCHWELCOME;
130  }
131  num_packets = (pmp->num_streams - 1) * pmp->audio_packets + 1;
132  avio_skip(pb, 8);
133  pmp->current_packet = 0;
135  &pmp->packet_sizes_alloc,
136  num_packets * sizeof(*pmp->packet_sizes));
137  if (!pmp->packet_sizes_alloc) {
138  av_log(s, AV_LOG_ERROR, "Cannot (re)allocate packet buffer\n");
139  return AVERROR(ENOMEM);
140  }
141  for (i = 0; i < num_packets; i++)
142  pmp->packet_sizes[i] = avio_rl32(pb);
143  }
144  ret = av_get_packet(pb, pkt, pmp->packet_sizes[pmp->current_packet]);
145  if (ret >= 0) {
146  ret = 0;
147  // FIXME: this is a hack that should be removed once
148  // compute_pkt_fields() can handle timestamps properly
149  if (pmp->cur_stream == 0)
150  pkt->dts = s->streams[0]->cur_dts++;
151  pkt->stream_index = pmp->cur_stream;
152  }
153  if (pmp->current_packet % pmp->audio_packets == 0)
154  pmp->cur_stream = (pmp->cur_stream + 1) % pmp->num_streams;
155  pmp->current_packet++;
156  return ret;
157 }
158 
159 static int pmp_seek(AVFormatContext *s, int stream_index, int64_t ts, int flags)
160 {
161  PMPContext *pmp = s->priv_data;
162  pmp->cur_stream = 0;
163  // fallback to default seek now
164  return -1;
165 }
166 
168 {
169  PMPContext *pmp = s->priv_data;
170  av_freep(&pmp->packet_sizes);
171  return 0;
172 }
173 
175  .name = "pmp",
176  .long_name = NULL_IF_CONFIG_SMALL("Playstation Portable PMP"),
177  .priv_data_size = sizeof(PMPContext),
181  .read_seek = pmp_seek,
183 };