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/*
* (C) 2015-2021 by Christian Hesse <mail@eworm.de>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <libavformat/avformat.h>
int main(int argc, char **argv) {
unsigned int i, j;
FILE * album_art;
char * album_art_file = NULL;
AVPacket pkt;
AVFormatContext * pFormatCtx;
if (argc < 2) {
printf("usage: %s file1.mp3 [file2.mp3 ...]\n", argv[0]);
return EXIT_FAILURE;
}
/* libav */
#if LIBAVCODEC_VERSION_INT < AV_VERSION_INT(58, 9, 100)
av_register_all();
#endif
/* only fatal messages from libav */
av_log_set_level(AV_LOG_FATAL);
pFormatCtx = avformat_alloc_context();
for (i = 1; i < argc; i++) {
if (avformat_open_input(&pFormatCtx, argv[i], NULL, NULL) != 0) {
fprintf(stderr, "%s: failed to open file for reading", argv[i]);
goto next;
}
/* only mp3 file contain artwork, so ignore others */
if (strcmp(pFormatCtx->iformat->name, "mp3") != 0) {
fprintf(stderr, "%s: not a mp3 file\n", argv[i]);
goto next;
}
if (pFormatCtx->iformat->read_header(pFormatCtx) < 0) {
fprintf(stderr, "%s: could not read the format header\n", argv[i]);
goto next;
}
/* find the first attached picture, if available */
for (j = 0; j < pFormatCtx->nb_streams; j++) {
if (pFormatCtx->streams[j]->disposition & AV_DISPOSITION_ATTACHED_PIC) {
pkt = pFormatCtx->streams[j]->attached_pic;
album_art_file = malloc(strlen(argv[i]) + 9);
sprintf(album_art_file, "%s.%03u.jpg", argv[i], j);
printf("%s: found artwork, writing to file %s\n", argv[i], album_art_file);
if ((album_art = fopen(album_art_file, "wb")) == NULL)
fprintf(stderr, "%s: failed to open file for writing\n", album_art_file);
if (fwrite(pkt.data, pkt.size, 1, album_art) != 1)
fprintf(stderr, "%s: failed to write to file\n", album_art_file);
fclose(album_art);
free(album_art_file);
}
}
next:
avformat_close_input(&pFormatCtx);
}
avformat_free_context(pFormatCtx);
return EXIT_SUCCESS;
}
// vim: set syntax=c:
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