FFmpeg  2.1.1
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 
54  AVStream *vst = avformat_new_stream(s, NULL);
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  avpriv_request_sample(s, "0 audio packets");
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  // fall back on 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 };
const char * s
Definition: avisynth_c.h:668
Bytestream IO Context.
Definition: avio.h:68
#define AVERROR_PATCHWELCOME
int size
#define AV_RN32(p)
Definition: intreadwrite.h:356
int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp, int size, int distance, int flags)
Add an index entry into a sorted list.
Definition: utils.c:1675
uint32_t * packet_sizes
Definition: pmpdec.c:31
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:478
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:3922
int64_t avio_size(AVIOContext *s)
Get the filesize.
Definition: aviobuf.c:261
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:686
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:593
void av_log(void *avcl, int level, const char *fmt,...) av_printf_format(3
Send the specified message to the log if the level is less than or equal to the current av_log_level...
static int pmp_header(AVFormatContext *s)
Definition: pmpdec.c:42
int current_packet
Definition: pmpdec.c:30
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:471
void av_freep(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:234
Format I/O context.
Definition: avformat.h:968
int64_t cur_dts
Definition: avformat.h:796
void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size)
Allocate a buffer, reusing the given one if large enough.
Definition: utils.c:153
void void avpriv_request_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:336
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:248
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:3348
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
Allocate and read the payload of a packet and initialize its fields with default values.
Definition: utils.c:200
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: avcodec.h:4147
static int pmp_probe(AVProbeData *p)
Definition: pmpdec.c:35
void * priv_data
Format private data.
Definition: avformat.h:988
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:151
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: avcodec.h:398
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:577
static int pmp_close(AVFormatContext *s)
Definition: pmpdec.c:181
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:54
ret
Definition: avfilter.c:961
int width
picture width / height.
Definition: avcodec.h:1314
AVStream ** streams
Definition: avformat.h:1016
int packet_sizes_alloc
Definition: pmpdec.c:32
int num_streams
Definition: pmpdec.c:28
int cur_stream
Definition: pmpdec.c:27
static int pmp_seek(AVFormatContext *s, int stream_index, int64_t ts, int flags)
Definition: pmpdec.c:173
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:592
Stream structure.
Definition: avformat.h:667
enum AVMediaType codec_type
Definition: avcodec.h:1154
enum AVCodecID codec_id
Definition: avcodec.h:1157
int sample_rate
samples per second
Definition: avcodec.h:1873
AVIOContext * pb
I/O context.
Definition: avformat.h:1001
static int read_packet(AVFormatContext *ctx, AVPacket *pkt)
Definition: libcdio.c:114
#define AVINDEX_KEYFRAME
Definition: avformat.h:616
This structure contains the data a format has to probe a file.
Definition: avformat.h:334
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:256
static int flags
Definition: cpu.c:45
#define AVERROR_EOF
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:342
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:720
int url_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:280
static int pmp_packet(AVFormatContext *s, AVPacket *pkt)
Definition: pmpdec.c:129
Main libavformat public API header.
AVInputFormat ff_pmp_demuxer
Definition: pmpdec.c:188
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:722
#define AVERROR_INVALIDDATA
#define AV_RL32(x)
Definition: intreadwrite.h:275
int channels
number of audio channels
Definition: avcodec.h:1874
#define AVERROR(e)
int audio_packets
Definition: pmpdec.c:29
int64_t dts
Decompression timestamp in AVStream-&gt;time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:1062
#define AV_LOG_FATAL
Something went wrong and recovery is not possible.
Definition: avcodec.h:4141
static AVPacket pkt
Definition: demuxing.c:52
int stream_index
Definition: avcodec.h:1065
This structure stores compressed data.
Definition: avcodec.h:1040