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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  uint32_t index_cnt;
48  int audio_codec_id = AV_CODEC_ID_NONE;
49  int srate, channels;
50  unsigned i;
51  uint64_t pos;
52  int64_t fsize = avio_size(pb);
53 
55  if (!vst)
56  return AVERROR(ENOMEM);
58  avio_skip(pb, 8);
59  switch (avio_rl32(pb)) {
60  case 0:
62  break;
63  case 1:
65  break;
66  default:
67  av_log(s, AV_LOG_ERROR, "Unsupported video format\n");
68  break;
69  }
70  index_cnt = avio_rl32(pb);
71  vst->codec->width = avio_rl32(pb);
72  vst->codec->height = avio_rl32(pb);
73 
74  tb_num = avio_rl32(pb);
75  tb_den = avio_rl32(pb);
76  avpriv_set_pts_info(vst, 32, tb_num, tb_den);
77  vst->nb_frames = index_cnt;
78  vst->duration = index_cnt;
79 
80  switch (avio_rl32(pb)) {
81  case 0:
82  audio_codec_id = AV_CODEC_ID_MP3;
83  break;
84  case 1:
85  av_log(s, AV_LOG_ERROR, "AAC not yet correctly supported\n");
86  audio_codec_id = AV_CODEC_ID_AAC;
87  break;
88  default:
89  av_log(s, AV_LOG_ERROR, "Unsupported audio format\n");
90  break;
91  }
92  pmp->num_streams = avio_rl16(pb) + 1;
93  avio_skip(pb, 10);
94  srate = avio_rl32(pb);
95  channels = avio_rl32(pb) + 1;
96  pos = avio_tell(pb) + 4LL*index_cnt;
97  for (i = 0; i < index_cnt; i++) {
98  uint32_t size = avio_rl32(pb);
99  int flags = size & 1 ? AVINDEX_KEYFRAME : 0;
100  if (url_feof(pb)) {
101  av_log(s, AV_LOG_FATAL, "Encountered EOF while reading index.\n");
102  return AVERROR_INVALIDDATA;
103  }
104  size >>= 1;
105  if (size < 9 + 4*pmp->num_streams) {
106  av_log(s, AV_LOG_ERROR, "Packet too small\n");
107  return AVERROR_INVALIDDATA;
108  }
109  av_add_index_entry(vst, pos, i, size, 0, flags);
110  pos += size;
111  if (fsize > 0 && i == 0 && pos > fsize) {
112  av_log(s, AV_LOG_ERROR, "File ends before first packet\n");
113  return AVERROR_INVALIDDATA;
114  }
115  }
116  for (i = 1; i < pmp->num_streams; i++) {
117  AVStream *ast = avformat_new_stream(s, NULL);
118  if (!ast)
119  return AVERROR(ENOMEM);
121  ast->codec->codec_id = audio_codec_id;
122  ast->codec->channels = channels;
123  ast->codec->sample_rate = srate;
124  avpriv_set_pts_info(ast, 32, 1, srate);
125  }
126  return 0;
127 }
128 
130 {
131  PMPContext *pmp = s->priv_data;
132  AVIOContext *pb = s->pb;
133  int ret = 0;
134  int i;
135 
136  if (url_feof(pb))
137  return AVERROR_EOF;
138  if (pmp->cur_stream == 0) {
139  int num_packets;
140  pmp->audio_packets = avio_r8(pb);
141  if (!pmp->audio_packets) {
142  av_log_ask_for_sample(s, "0 audio packets\n");
143  return AVERROR_PATCHWELCOME;
144  }
145  num_packets = (pmp->num_streams - 1) * pmp->audio_packets + 1;
146  avio_skip(pb, 8);
147  pmp->current_packet = 0;
149  &pmp->packet_sizes_alloc,
150  num_packets * sizeof(*pmp->packet_sizes));
151  if (!pmp->packet_sizes_alloc) {
152  av_log(s, AV_LOG_ERROR, "Cannot (re)allocate packet buffer\n");
153  return AVERROR(ENOMEM);
154  }
155  for (i = 0; i < num_packets; i++)
156  pmp->packet_sizes[i] = avio_rl32(pb);
157  }
158  ret = av_get_packet(pb, pkt, pmp->packet_sizes[pmp->current_packet]);
159  if (ret >= 0) {
160  ret = 0;
161  // FIXME: this is a hack that should be removed once
162  // compute_pkt_fields() can handle timestamps properly
163  if (pmp->cur_stream == 0)
164  pkt->dts = s->streams[0]->cur_dts++;
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  // fallback to default seek now
178  return -1;
179 }
180 
182 {
183  PMPContext *pmp = s->priv_data;
184  av_freep(&pmp->packet_sizes);
185  return 0;
186 }
187 
189  .name = "pmp",
190  .long_name = NULL_IF_CONFIG_SMALL("Playstation Portable PMP"),
191  .priv_data_size = sizeof(PMPContext),
195  .read_seek = pmp_seek,
197 };