FFmpeg
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(const 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->codecpar->width = avio_rl32(pb);
72  vst->codecpar->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 (avio_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++) {
118  if (!ast)
119  return AVERROR(ENOMEM);
121  ast->codecpar->codec_id = audio_codec_id;
122  ast->codecpar->channels = channels;
123  ast->codecpar->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 (avio_feof(pb))
137  return AVERROR_EOF;
138  if (pmp->cur_stream == 0) {
139  int num_packets;
140  pmp->audio_packets = avio_r8(pb);
141 
142  if (!pmp->audio_packets) {
143  av_log(s, AV_LOG_ERROR, "No audio packets.\n");
144  return AVERROR_INVALIDDATA;
145  }
146 
147  num_packets = (pmp->num_streams - 1) * pmp->audio_packets + 1;
148  avio_skip(pb, 8);
149  pmp->current_packet = 0;
151  &pmp->packet_sizes_alloc,
152  num_packets * sizeof(*pmp->packet_sizes));
153  if (!pmp->packet_sizes_alloc) {
154  av_log(s, AV_LOG_ERROR, "Cannot (re)allocate packet buffer\n");
155  return AVERROR(ENOMEM);
156  }
157  for (i = 0; i < num_packets; i++)
158  pmp->packet_sizes[i] = avio_rl32(pb);
159  }
160  ret = av_get_packet(pb, pkt, pmp->packet_sizes[pmp->current_packet]);
161  if (ret >= 0) {
162  ret = 0;
163  pkt->stream_index = pmp->cur_stream;
164  }
165  if (pmp->current_packet % pmp->audio_packets == 0)
166  pmp->cur_stream = (pmp->cur_stream + 1) % pmp->num_streams;
167  pmp->current_packet++;
168  return ret;
169 }
170 
171 static int pmp_seek(AVFormatContext *s, int stream_index, int64_t ts, int flags)
172 {
173  PMPContext *pmp = s->priv_data;
174  pmp->cur_stream = 0;
175  // fall back on default seek now
176  return -1;
177 }
178 
180 {
181  PMPContext *pmp = s->priv_data;
182  av_freep(&pmp->packet_sizes);
183  return 0;
184 }
185 
187  .name = "pmp",
188  .long_name = NULL_IF_CONFIG_SMALL("Playstation Portable PMP"),
189  .priv_data_size = sizeof(PMPContext),
193  .read_seek = pmp_seek,
195 };
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:724
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
AV_CODEC_ID_MPEG4
@ AV_CODEC_ID_MPEG4
Definition: codec_id.h:62
PMPContext::audio_packets
int audio_packets
Definition: pmpdec.c:29
avio_size
int64_t avio_size(AVIOContext *s)
Get the filesize.
Definition: aviobuf.c:338
pmp_close
static int pmp_close(AVFormatContext *s)
Definition: pmpdec.c:179
AVINDEX_KEYFRAME
#define AVINDEX_KEYFRAME
Definition: avformat.h:785
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
AVCodecParameters::channels
int channels
Audio only.
Definition: codec_par.h:166
read_seek
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:149
av_add_index_entry
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: seek.c:117
read_close
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:141
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:486
AV_CODEC_ID_MP3
@ AV_CODEC_ID_MP3
preferred ID for decoding MPEG audio layer 1, 2 or 3
Definition: codec_id.h:423
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:888
avio_rl16
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:726
pkt
AVPacket * pkt
Definition: movenc.c:59
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
AVInputFormat
Definition: avformat.h:626
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:631
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:448
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AVCodecParameters::width
int width
Video only.
Definition: codec_par.h:126
PMPContext::cur_stream
int cur_stream
Definition: pmpdec.c:27
channels
channels
Definition: aptx.h:33
fsize
static int64_t fsize(FILE *f)
Definition: audiomatch.c:29
AV_CODEC_ID_H264
@ AV_CODEC_ID_H264
Definition: codec_id.h:77
pmp_probe
static int pmp_probe(const AVProbeData *p)
Definition: pmpdec.c:35
AVFormatContext
Format I/O context.
Definition: avformat.h:1097
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:992
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
NULL
#define NULL
Definition: coverity.c:32
read_probe
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
AV_RN32
#define AV_RN32(p)
Definition: intreadwrite.h:364
PMPContext::num_streams
int num_streams
Definition: pmpdec.c:28
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:446
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:170
AVStream::nb_frames
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:890
AV_CODEC_ID_AAC
@ AV_CODEC_ID_AAC
Definition: codec_id.h:424
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:742
AVIOContext
Bytestream IO Context.
Definition: avio.h:161
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
size
int size
Definition: twinvq_data.h:10344
PMPContext::packet_sizes
uint32_t * packet_sizes
Definition: pmpdec.c:31
ff_pmp_demuxer
const AVInputFormat ff_pmp_demuxer
Definition: pmpdec.c:186
avio_r8
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:616
i
int i
Definition: input.c:406
AV_CODEC_ID_NONE
@ AV_CODEC_ID_NONE
Definition: codec_id.h:48
pmp_header
static int pmp_header(AVFormatContext *s)
Definition: pmpdec.c:42
AVCodecParameters::height
int height
Definition: codec_par.h:127
pmp_seek
static int pmp_seek(AVFormatContext *s, int stream_index, int64_t ts, int flags)
Definition: pmpdec.c:171
av_get_packet
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:196
PMPContext::current_packet
int current_packet
Definition: pmpdec.c:30
ret
ret
Definition: filter_design.txt:187
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVStream
Stream structure.
Definition: avformat.h:845
AV_LOG_FATAL
#define AV_LOG_FATAL
Something went wrong and recovery is not possible.
Definition: log.h:174
pos
unsigned int pos
Definition: spdifenc.c:412
avformat.h
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:92
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *st, 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:1146
AVPacket::stream_index
int stream_index
Definition: packet.h:375
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:333
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
PMPContext
Definition: pmpdec.c:26
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
AVPacket
This structure stores compressed data.
Definition: packet.h:350
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
av_fast_malloc
void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size)
Allocate a buffer, reusing the given one if large enough.
Definition: mem.c:560
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
pmp_packet
static int pmp_packet(AVFormatContext *s, AVPacket *pkt)
Definition: pmpdec.c:129
PMPContext::packet_sizes_alloc
int packet_sizes_alloc
Definition: pmpdec.c:32
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:360