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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 "avformat.h"
  24. #include "flac_picture.h"
  25. #include "id3v2.h"
  26. #include "internal.h"
  27.  
  28. int ff_flac_parse_picture(AVFormatContext *s, uint8_t *buf, int buf_size)
  29. {
  30.     const CodecMime *mime = ff_id3v2_mime_tags;
  31.     enum AVCodecID id = AV_CODEC_ID_NONE;
  32.     AVBufferRef *data = NULL;
  33.     uint8_t mimetype[64], *desc = NULL;
  34.     AVIOContext *pb = NULL;
  35.     AVStream *st;
  36.     int type, width, height;
  37.     int len, ret = 0;
  38.  
  39.     pb = avio_alloc_context(buf, buf_size, 0, NULL, NULL, NULL, NULL);
  40.     if (!pb)
  41.         return AVERROR(ENOMEM);
  42.  
  43.     /* read the picture type */
  44.     type = avio_rb32(pb);
  45.     if (type >= FF_ARRAY_ELEMS(ff_id3v2_picture_types) || type < 0) {
  46.         av_log(s, AV_LOG_ERROR, "Invalid picture type: %d.\n", type);
  47.         if (s->error_recognition & AV_EF_EXPLODE) {
  48.             RETURN_ERROR(AVERROR_INVALIDDATA);
  49.         }
  50.         type = 0;
  51.     }
  52.  
  53.     /* picture mimetype */
  54.     len = avio_rb32(pb);
  55.     if (len <= 0 ||
  56.         avio_read(pb, mimetype, FFMIN(len, sizeof(mimetype) - 1)) != len) {
  57.         av_log(s, AV_LOG_ERROR, "Could not read mimetype from an attached "
  58.                "picture.\n");
  59.         if (s->error_recognition & AV_EF_EXPLODE)
  60.             ret = AVERROR_INVALIDDATA;
  61.         goto fail;
  62.     }
  63.     av_assert0(len < sizeof(mimetype));
  64.     mimetype[len] = 0;
  65.  
  66.     while (mime->id != AV_CODEC_ID_NONE) {
  67.         if (!strncmp(mime->str, mimetype, sizeof(mimetype))) {
  68.             id = mime->id;
  69.             break;
  70.         }
  71.         mime++;
  72.     }
  73.     if (id == AV_CODEC_ID_NONE) {
  74.         av_log(s, AV_LOG_ERROR, "Unknown attached picture mimetype: %s.\n",
  75.                mimetype);
  76.         if (s->error_recognition & AV_EF_EXPLODE)
  77.             ret = AVERROR_INVALIDDATA;
  78.         goto fail;
  79.     }
  80.  
  81.     /* picture description */
  82.     len = avio_rb32(pb);
  83.     if (len > 0) {
  84.         if (!(desc = av_malloc(len + 1))) {
  85.             RETURN_ERROR(AVERROR(ENOMEM));
  86.         }
  87.  
  88.         if (avio_read(pb, desc, len) != len) {
  89.             av_log(s, AV_LOG_ERROR, "Error reading attached picture description.\n");
  90.             if (s->error_recognition & AV_EF_EXPLODE)
  91.                 ret = AVERROR(EIO);
  92.             goto fail;
  93.         }
  94.         desc[len] = 0;
  95.     }
  96.  
  97.     /* picture metadata */
  98.     width  = avio_rb32(pb);
  99.     height = avio_rb32(pb);
  100.     avio_skip(pb, 8);
  101.  
  102.     /* picture data */
  103.     len = avio_rb32(pb);
  104.     if (len <= 0) {
  105.         av_log(s, AV_LOG_ERROR, "Invalid attached picture size: %d.\n", len);
  106.         if (s->error_recognition & AV_EF_EXPLODE)
  107.             ret = AVERROR_INVALIDDATA;
  108.         goto fail;
  109.     }
  110.     if (!(data = av_buffer_alloc(len))) {
  111.         RETURN_ERROR(AVERROR(ENOMEM));
  112.     }
  113.     if (avio_read(pb, data->data, len) != len) {
  114.         av_log(s, AV_LOG_ERROR, "Error reading attached picture data.\n");
  115.         if (s->error_recognition & AV_EF_EXPLODE)
  116.             ret = AVERROR(EIO);
  117.         goto fail;
  118.     }
  119.  
  120.     st = avformat_new_stream(s, NULL);
  121.     if (!st) {
  122.         RETURN_ERROR(AVERROR(ENOMEM));
  123.     }
  124.  
  125.     av_init_packet(&st->attached_pic);
  126.     st->attached_pic.buf          = data;
  127.     st->attached_pic.data         = data->data;
  128.     st->attached_pic.size         = len;
  129.     st->attached_pic.stream_index = st->index;
  130.     st->attached_pic.flags       |= AV_PKT_FLAG_KEY;
  131.  
  132.     st->disposition      |= AV_DISPOSITION_ATTACHED_PIC;
  133.     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
  134.     st->codec->codec_id   = id;
  135.     st->codec->width      = width;
  136.     st->codec->height     = height;
  137.     av_dict_set(&st->metadata, "comment", ff_id3v2_picture_types[type], 0);
  138.     if (desc)
  139.         av_dict_set(&st->metadata, "title", desc, AV_DICT_DONT_STRDUP_VAL);
  140.  
  141.     av_freep(&pb);
  142.  
  143.     return 0;
  144.  
  145. fail:
  146.     av_buffer_unref(&data);
  147.     av_freep(&desc);
  148.     av_freep(&pb);
  149.  
  150.     return ret;
  151. }
  152.