FFmpeg  4.4.6
lavfutils.c
Go to the documentation of this file.
1 /*
2  * Copyright 2012 Stefano Sabatini <stefasab gmail com>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "libavutil/imgutils.h"
22 #include "libavformat/avformat.h"
23 #include "lavfutils.h"
24 
25 int ff_load_image(uint8_t *data[4], int linesize[4],
26  int *w, int *h, enum AVPixelFormat *pix_fmt,
27  const char *filename, void *log_ctx)
28 {
30  AVFormatContext *format_ctx = NULL;
31  const AVCodec *codec;
32  AVCodecContext *codec_ctx = NULL;
33  AVCodecParameters *par;
34  AVFrame *frame = NULL;
35  int ret = 0;
36  AVPacket pkt;
37  AVDictionary *opt=NULL;
38 
39  iformat = av_find_input_format("image2pipe");
40  if ((ret = avformat_open_input(&format_ctx, filename, iformat, NULL)) < 0) {
41  av_log(log_ctx, AV_LOG_ERROR,
42  "Failed to open input file '%s'\n", filename);
43  return ret;
44  }
45 
46  if ((ret = avformat_find_stream_info(format_ctx, NULL)) < 0) {
47  av_log(log_ctx, AV_LOG_ERROR, "Find stream info failed\n");
48  goto end;
49  }
50 
51  par = format_ctx->streams[0]->codecpar;
52  codec = avcodec_find_decoder(par->codec_id);
53  if (!codec) {
54  av_log(log_ctx, AV_LOG_ERROR, "Failed to find codec\n");
55  ret = AVERROR(EINVAL);
56  goto end;
57  }
58 
59  codec_ctx = avcodec_alloc_context3(codec);
60  if (!codec_ctx) {
61  av_log(log_ctx, AV_LOG_ERROR, "Failed to alloc video decoder context\n");
62  ret = AVERROR(ENOMEM);
63  goto end;
64  }
65 
66  ret = avcodec_parameters_to_context(codec_ctx, par);
67  if (ret < 0) {
68  av_log(log_ctx, AV_LOG_ERROR, "Failed to copy codec parameters to decoder context\n");
69  goto end;
70  }
71 
72  av_dict_set(&opt, "thread_type", "slice", 0);
73  if ((ret = avcodec_open2(codec_ctx, codec, &opt)) < 0) {
74  av_log(log_ctx, AV_LOG_ERROR, "Failed to open codec\n");
75  goto end;
76  }
77 
78  if (!(frame = av_frame_alloc()) ) {
79  av_log(log_ctx, AV_LOG_ERROR, "Failed to alloc frame\n");
80  ret = AVERROR(ENOMEM);
81  goto end;
82  }
83 
84  ret = av_read_frame(format_ctx, &pkt);
85  if (ret < 0) {
86  av_log(log_ctx, AV_LOG_ERROR, "Failed to read frame from file\n");
87  goto end;
88  }
89 
90  ret = avcodec_send_packet(codec_ctx, &pkt);
92  if (ret < 0) {
93  av_log(log_ctx, AV_LOG_ERROR, "Error submitting a packet to decoder\n");
94  goto end;
95  }
96 
97  ret = avcodec_receive_frame(codec_ctx, frame);
98  if (ret < 0) {
99  av_log(log_ctx, AV_LOG_ERROR, "Failed to decode image from file\n");
100  goto end;
101  }
102 
103  *w = frame->width;
104  *h = frame->height;
105  *pix_fmt = frame->format;
106 
107  if ((ret = av_image_alloc(data, linesize, *w, *h, *pix_fmt, 16)) < 0)
108  goto end;
109  ret = 0;
110 
111  av_image_copy(data, linesize, (const uint8_t **)frame->data, frame->linesize, *pix_fmt, *w, *h);
112 
113 end:
114  avcodec_free_context(&codec_ctx);
115  avformat_close_input(&format_ctx);
117  av_dict_free(&opt);
118 
119  if (ret < 0)
120  av_log(log_ctx, AV_LOG_ERROR, "Error loading image file '%s'\n", filename);
121  return ret;
122 }
uint8_t
Main libavformat public API header.
#define NULL
Definition: coverity.c:32
static enum AVPixelFormat pix_fmt
static AVFrame * frame
static AVInputFormat * iformat
Definition: ffprobe.c:260
int attribute_align_arg avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
Initialize the AVCodecContext to use the given AVCodec.
Definition: avcodec.c:144
AVCodec * avcodec_find_decoder(enum AVCodecID id)
Find a registered decoder with a matching codec ID.
Definition: allcodecs.c:946
int avcodec_parameters_to_context(AVCodecContext *codec, const AVCodecParameters *par)
Fill the codec context based on the values from the supplied codec parameters.
Definition: codec_par.c:147
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
Definition: options.c:173
void avcodec_free_context(AVCodecContext **avctx)
Free the codec context and everything associated with it and write NULL to the provided pointer.
Definition: options.c:188
int avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame)
Return decoded output data from a decoder.
Definition: decode.c:652
int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt)
Supply raw packet data as input to a decoder.
Definition: decode.c:589
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:634
ff_const59 AVInputFormat * av_find_input_format(const char *short_name)
Find AVInputFormat based on the short name of the input format.
Definition: format.c:143
int av_read_frame(AVFormatContext *s, AVPacket *pkt)
Return the next frame of a stream.
Definition: utils.c:1741
int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
Read packets of a media file to get stream information.
Definition: utils.c:3602
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
Definition: utils.c:4481
int avformat_open_input(AVFormatContext **ps, const char *url, ff_const59 AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
Definition: utils.c:512
void av_dict_free(AVDictionary **pm)
Free all the memory allocated for an AVDictionary struct and all keys and values.
Definition: dict.c:203
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 AVERROR(e)
Definition: error.h:43
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:203
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:190
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
void av_image_copy(uint8_t *dst_data[4], int dst_linesizes[4], const uint8_t *src_data[4], const int src_linesizes[4], enum AVPixelFormat pix_fmt, int width, int height)
Copy image in src_data to dst_data.
Definition: imgutils.c:422
int av_image_alloc(uint8_t *pointers[4], int linesizes[4], int w, int h, enum AVPixelFormat pix_fmt, int align)
Allocate an image with size w and h and pixel format pix_fmt, and fill pointers and linesizes accordi...
Definition: imgutils.c:216
misc image utilities
int ff_load_image(uint8_t *data[4], int linesize[4], int *w, int *h, enum AVPixelFormat *pix_fmt, const char *filename, void *log_ctx)
Load image from filename and put the resulting image in data.
Definition: lavfutils.c:25
Miscellaneous utilities which make use of the libavformat library.
uint8_t w
Definition: llviddspenc.c:39
const char data[16]
Definition: mxf.c:142
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
main external API structure.
Definition: avcodec.h:536
This struct describes the properties of an encoded stream.
Definition: codec_par.h:52
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
AVCodec.
Definition: codec.h:197
Format I/O context.
Definition: avformat.h:1232
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1300
This structure describes decoded (raw) audio or video data.
Definition: frame.h:318
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:332
int width
Definition: frame.h:376
int height
Definition: frame.h:376
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:349
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames,...
Definition: frame.h:391
This structure stores compressed data.
Definition: packet.h:346
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1038
#define av_log(a,...)
AVPacket * pkt
Definition: movenc.c:59