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/*
* Raw FLAC picture parser
* Copyright (c) 2001 Fabrice Bellard
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/avassert.h"
#include "libavutil/intreadwrite.h"
#include "libavcodec/png.h"
#include "avformat.h"
#include "flac_picture.h"
#include "id3v2.h"
#include "internal.h"
#include "avio_internal.h"
int ff_flac_parse_picture(AVFormatContext *s, uint8_t *buf, int buf_size)
{
const CodecMime *mime = ff_id3v2_mime_tags;
enum AVCodecID id = AV_CODEC_ID_NONE;
AVBufferRef *data = NULL;
uint8_t mimetype[64], *desc = NULL;
AVIOContext pb0, *pb = &pb0;
AVStream *st;
int width, height, ret = 0;
int len;
unsigned int type;
ffio_init_context(pb, buf, buf_size, 0, NULL, NULL, NULL, NULL);
/* read the picture type */
type = avio_rb32(pb);
if (type >= FF_ARRAY_ELEMS(ff_id3v2_picture_types)) {
av_log(s, AV_LOG_ERROR, "Invalid picture type: %d.\n", type);
if (s->error_recognition & AV_EF_EXPLODE) {
RETURN_ERROR(AVERROR_INVALIDDATA);
}
type = 0;
}
/* picture mimetype */
len = avio_rb32(pb);
if (len <= 0 || len >= 64 ||
avio_read(pb, mimetype, FFMIN(len, sizeof(mimetype) - 1)) != len) {
av_log(s, AV_LOG_ERROR, "Could not read mimetype from an attached "
"picture.\n");
if (s->error_recognition & AV_EF_EXPLODE)
ret = AVERROR_INVALIDDATA;
goto fail;
}
av_assert0(len < sizeof(mimetype));
mimetype[len] = 0;
while (mime->id != AV_CODEC_ID_NONE) {
if (!strncmp(mime->str, mimetype, sizeof(mimetype))) {
id = mime->id;
break;
}
mime++;
}
if (id == AV_CODEC_ID_NONE) {
av_log(s, AV_LOG_ERROR, "Unknown attached picture mimetype: %s.\n",
mimetype);
if (s->error_recognition & AV_EF_EXPLODE)
ret = AVERROR_INVALIDDATA;
goto fail;
}
/* picture description */
len = avio_rb32(pb);
if (len > 0) {
if (!(desc = av_malloc(len + 1))) {
RETURN_ERROR(AVERROR(ENOMEM));
}
if (avio_read(pb, desc, len) != len) {
av_log(s, AV_LOG_ERROR, "Error reading attached picture description.\n");
if (s->error_recognition & AV_EF_EXPLODE)
ret = AVERROR(EIO);
goto fail;
}
desc[len] = 0;
}
/* picture metadata */
width = avio_rb32(pb);
height = avio_rb32(pb);
avio_skip(pb, 8);
/* picture data */
len = avio_rb32(pb);
if (len <= 0) {
av_log(s, AV_LOG_ERROR, "Invalid attached picture size: %d.\n", len);
if (s->error_recognition & AV_EF_EXPLODE)
ret = AVERROR_INVALIDDATA;
goto fail;
}
if (!(data = av_buffer_alloc(len + AV_INPUT_BUFFER_PADDING_SIZE))) {
RETURN_ERROR(AVERROR(ENOMEM));
}
memset(data->data + len, 0, AV_INPUT_BUFFER_PADDING_SIZE);
if (avio_read(pb, data->data, len) != len) {
av_log(s, AV_LOG_ERROR, "Error reading attached picture data.\n");
if (s->error_recognition & AV_EF_EXPLODE)
ret = AVERROR(EIO);
goto fail;
}
if (AV_RB64(data->data) == PNGSIG)
id = AV_CODEC_ID_PNG;
st = avformat_new_stream(s, NULL);
if (!st) {
RETURN_ERROR(AVERROR(ENOMEM));
}
av_init_packet(&st->attached_pic);
st->attached_pic.buf = data;
st->attached_pic.data = data->data;
st->attached_pic.size = len;
st->attached_pic.stream_index = st->index;
st->attached_pic.flags |= AV_PKT_FLAG_KEY;
st->disposition |= AV_DISPOSITION_ATTACHED_PIC;
st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
st->codecpar->codec_id = id;
st->codecpar->width = width;
st->codecpar->height = height;
av_dict_set(&st->metadata, "comment", ff_id3v2_picture_types[type], 0);
if (desc)
av_dict_set(&st->metadata, "title", desc, AV_DICT_DONT_STRDUP_VAL);
return 0;
fail:
av_buffer_unref(&data);
av_freep(&desc);
return ret;
}
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