FFmpeg
flac_picture.c
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1 /*
2  * Raw FLAC picture parser
3  * Copyright (c) 2001 Fabrice Bellard
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/avassert.h"
23 #include "libavutil/intreadwrite.h"
24 #include "libavcodec/png.h"
25 #include "avformat.h"
26 #include "flac_picture.h"
27 #include "id3v2.h"
28 #include "internal.h"
29 
31 {
32  const CodecMime *mime = ff_id3v2_mime_tags;
33  enum AVCodecID id = AV_CODEC_ID_NONE;
35  uint8_t mimetype[64], *desc = NULL;
36  AVIOContext *pb = NULL;
37  AVStream *st;
38  int width, height, ret = 0;
39  int len;
40  unsigned int type;
41 
42  pb = avio_alloc_context(buf, buf_size, 0, NULL, NULL, NULL, NULL);
43  if (!pb)
44  return AVERROR(ENOMEM);
45 
46  /* read the picture type */
47  type = avio_rb32(pb);
49  av_log(s, AV_LOG_ERROR, "Invalid picture type: %d.\n", type);
52  }
53  type = 0;
54  }
55 
56  /* picture mimetype */
57  len = avio_rb32(pb);
58  if (len <= 0 || len >= 64 ||
59  avio_read(pb, mimetype, FFMIN(len, sizeof(mimetype) - 1)) != len) {
60  av_log(s, AV_LOG_ERROR, "Could not read mimetype from an attached "
61  "picture.\n");
63  ret = AVERROR_INVALIDDATA;
64  goto fail;
65  }
66  av_assert0(len < sizeof(mimetype));
67  mimetype[len] = 0;
68 
69  while (mime->id != AV_CODEC_ID_NONE) {
70  if (!strncmp(mime->str, mimetype, sizeof(mimetype))) {
71  id = mime->id;
72  break;
73  }
74  mime++;
75  }
76  if (id == AV_CODEC_ID_NONE) {
77  av_log(s, AV_LOG_ERROR, "Unknown attached picture mimetype: %s.\n",
78  mimetype);
80  ret = AVERROR_INVALIDDATA;
81  goto fail;
82  }
83 
84  /* picture description */
85  len = avio_rb32(pb);
86  if (len > 0) {
87  if (!(desc = av_malloc(len + 1))) {
88  RETURN_ERROR(AVERROR(ENOMEM));
89  }
90 
91  if (avio_read(pb, desc, len) != len) {
92  av_log(s, AV_LOG_ERROR, "Error reading attached picture description.\n");
94  ret = AVERROR(EIO);
95  goto fail;
96  }
97  desc[len] = 0;
98  }
99 
100  /* picture metadata */
101  width = avio_rb32(pb);
102  height = avio_rb32(pb);
103  avio_skip(pb, 8);
104 
105  /* picture data */
106  len = avio_rb32(pb);
107  if (len <= 0) {
108  av_log(s, AV_LOG_ERROR, "Invalid attached picture size: %d.\n", len);
110  ret = AVERROR_INVALIDDATA;
111  goto fail;
112  }
113  if (!(data = av_buffer_alloc(len + AV_INPUT_BUFFER_PADDING_SIZE))) {
114  RETURN_ERROR(AVERROR(ENOMEM));
115  }
116  memset(data->data + len, 0, AV_INPUT_BUFFER_PADDING_SIZE);
117  if (avio_read(pb, data->data, len) != len) {
118  av_log(s, AV_LOG_ERROR, "Error reading attached picture data.\n");
120  ret = AVERROR(EIO);
121  goto fail;
122  }
123 
124  if (AV_RB64(data->data) == PNGSIG)
125  id = AV_CODEC_ID_PNG;
126 
127  st = avformat_new_stream(s, NULL);
128  if (!st) {
129  RETURN_ERROR(AVERROR(ENOMEM));
130  }
131 
133  st->attached_pic.buf = data;
134  st->attached_pic.data = data->data;
135  st->attached_pic.size = len;
136  st->attached_pic.stream_index = st->index;
138 
141  st->codecpar->codec_id = id;
142  st->codecpar->width = width;
143  st->codecpar->height = height;
144  av_dict_set(&st->metadata, "comment", ff_id3v2_picture_types[type], 0);
145  if (desc)
146  av_dict_set(&st->metadata, "title", desc, AV_DICT_DONT_STRDUP_VAL);
147 
148  avio_context_free(&pb);
149 
150  return 0;
151 
152 fail:
153  av_buffer_unref(&data);
154  av_freep(&desc);
155  avio_context_free(&pb);
156 
157  return ret;
158 }
#define NULL
Definition: coverity.c:32
Bytestream IO Context.
Definition: avio.h:161
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
void av_buffer_unref(AVBufferRef **buf)
Free a given reference and automatically free the buffer if there are no more references to it...
Definition: buffer.c:125
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:100
const char * desc
Definition: nvenc.c:68
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3959
int index
stream index in AVFormatContext
Definition: avformat.h:882
int size
Definition: avcodec.h:1480
GLint GLenum type
Definition: opengl_enc.c:104
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:334
Format I/O context.
Definition: avformat.h:1358
char str[32]
Definition: internal.h:50
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
uint8_t
#define av_malloc(s)
int width
Video only.
Definition: avcodec.h:4025
unsigned int avio_rb32(AVIOContext *s)
Definition: aviobuf.c:803
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4469
#define height
uint8_t * data
Definition: avcodec.h:1479
enum AVCodecID id
Definition: internal.h:51
#define av_log(a,...)
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:650
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: avcodec.h:1511
AVIOContext * avio_alloc_context(unsigned char *buffer, int buffer_size, int write_flag, void *opaque, int(*read_packet)(void *opaque, uint8_t *buf, int buf_size), int(*write_packet)(void *opaque, uint8_t *buf, int buf_size), int64_t(*seek)(void *opaque, int64_t offset, int whence))
Allocate and initialize an AVIOContext for buffered I/O.
Definition: aviobuf.c:131
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: avcodec.h:215
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3955
AVBufferRef * buf
A reference to the reference-counted buffer where the packet data is stored.
Definition: avcodec.h:1462
#define PNGSIG
Definition: png.h:47
simple assert() macros that are a bit more flexible than ISO C assert().
#define fail()
Definition: checkasm.h:121
int flags
A combination of AV_PKT_FLAG values.
Definition: avcodec.h:1485
const CodecMime ff_id3v2_mime_tags[]
Definition: id3v2.c:131
#define FFMIN(a, b)
Definition: common.h:96
#define width
#define AV_DICT_DONT_STRDUP_VAL
Take ownership of a value that&#39;s been allocated with av_malloc() or another memory allocation functio...
Definition: dict.h:76
#define s(width, name)
Definition: cbs_vp9.c:257
int ff_flac_parse_picture(AVFormatContext *s, uint8_t *buf, int buf_size)
Definition: flac_picture.c:30
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:2707
AVDictionary * metadata
Definition: avformat.h:945
#define FF_ARRAY_ELEMS(a)
#define AV_DISPOSITION_ATTACHED_PIC
The stream is stored in the file as an attached picture/"cover art" (e.g.
Definition: avformat.h:849
Stream structure.
Definition: avformat.h:881
AVBufferRef * av_buffer_alloc(int size)
Allocate an AVBuffer of the given size using av_malloc().
Definition: buffer.c:67
uint8_t * data
The data buffer.
Definition: buffer.h:89
void * buf
Definition: avisynth_c.h:766
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
Definition: dict.c:70
#define RETURN_ERROR(code)
Definition: flac_picture.h:27
A reference to a data buffer.
Definition: buffer.h:81
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_RB64
Definition: bytestream.h:87
Main libavformat public API header.
int error_recognition
Error recognition; higher values will detect more errors but may misdetect some more or less valid pa...
Definition: avformat.h:1625
int disposition
AV_DISPOSITION_* bit field.
Definition: avformat.h:934
void avio_context_free(AVIOContext **s)
Free the supplied IO context and everything associated with it.
Definition: aviobuf.c:148
void av_init_packet(AVPacket *pkt)
Initialize optional fields of a packet with default values.
Definition: avpacket.c:33
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding...
Definition: avcodec.h:792
int len
#define av_freep(p)
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1028
const char *const ff_id3v2_picture_types[21]
Definition: id3v2.c:107
int stream_index
Definition: avcodec.h:1481
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
enum AVCodecID id
AVPacket attached_pic
For streams with AV_DISPOSITION_ATTACHED_PIC disposition, this packet will contain the attached pictu...
Definition: avformat.h:963