mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-25 00:32:31 +00:00
120 lines
3.3 KiB
C
120 lines
3.3 KiB
C
/*
|
|
* 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 <stddef.h>
|
|
#include <stdint.h>
|
|
|
|
#include "atsc_a53.h"
|
|
#include "get_bits.h"
|
|
|
|
int ff_alloc_a53_sei(const AVFrame *frame, size_t prefix_len,
|
|
void **data, size_t *sei_size)
|
|
{
|
|
AVFrameSideData *side_data = NULL;
|
|
uint8_t *sei_data;
|
|
|
|
if (frame)
|
|
side_data = av_frame_get_side_data(frame, AV_FRAME_DATA_A53_CC);
|
|
|
|
if (!side_data) {
|
|
*data = NULL;
|
|
return 0;
|
|
}
|
|
|
|
*sei_size = side_data->size + 11;
|
|
*data = av_mallocz(*sei_size + prefix_len);
|
|
if (!*data)
|
|
return AVERROR(ENOMEM);
|
|
sei_data = (uint8_t*)*data + prefix_len;
|
|
|
|
// country code
|
|
sei_data[0] = 181;
|
|
sei_data[1] = 0;
|
|
sei_data[2] = 49;
|
|
|
|
/**
|
|
* 'GA94' is standard in North America for ATSC, but hard coding
|
|
* this style may not be the right thing to do -- other formats
|
|
* do exist. This information is not available in the side_data
|
|
* so we are going with this right now.
|
|
*/
|
|
AV_WL32(sei_data + 3, MKTAG('G', 'A', '9', '4'));
|
|
sei_data[7] = 3;
|
|
sei_data[8] = ((side_data->size/3) & 0x1f) | 0x40;
|
|
sei_data[9] = 0;
|
|
|
|
memcpy(sei_data + 10, side_data->data, side_data->size);
|
|
|
|
sei_data[side_data->size+10] = 255;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int ff_parse_a53_cc(AVBufferRef **pbuf, const uint8_t *data, int size)
|
|
{
|
|
AVBufferRef *buf = *pbuf;
|
|
GetBitContext gb;
|
|
size_t new_size, old_size = buf ? buf->size : 0;
|
|
int ret, cc_count;
|
|
|
|
if (size < 3)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
ret = init_get_bits8(&gb, data, size);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (get_bits(&gb, 8) != 0x3) // user_data_type_code
|
|
return 0;
|
|
|
|
skip_bits(&gb, 1); // reserved
|
|
if (!get_bits(&gb, 1)) // process_cc_data_flag
|
|
return 0;
|
|
|
|
skip_bits(&gb, 1); // zero bit
|
|
cc_count = get_bits(&gb, 5);
|
|
if (!cc_count)
|
|
return 0;
|
|
|
|
skip_bits(&gb, 8); // reserved
|
|
|
|
/* 3 bytes per CC plus one byte marker_bits at the end */
|
|
if (cc_count * 3 >= (get_bits_left(&gb) >> 3))
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
new_size = (old_size + cc_count * 3);
|
|
|
|
if (new_size > INT_MAX)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
/* Allow merging of the cc data from two fields. */
|
|
ret = av_buffer_realloc(pbuf, new_size);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
buf = *pbuf;
|
|
/* Use of av_buffer_realloc assumes buffer is writeable */
|
|
for (int i = 0; i < cc_count; i++) {
|
|
buf->data[old_size++] = get_bits(&gb, 8);
|
|
buf->data[old_size++] = get_bits(&gb, 8);
|
|
buf->data[old_size++] = get_bits(&gb, 8);
|
|
}
|
|
|
|
return cc_count;
|
|
}
|