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h264: Add support for Closed Caption export

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Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
This commit is contained in:
Kieran Kunhya 2015-07-08 23:17:44 +01:00 committed by Vittorio Giovara
parent 2cb34f82b9
commit b0017579b6
3 changed files with 58 additions and 1 deletions
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12
libavcodec/h264.c
View File

@ -832,6 +832,18 @@ static void decode_postinit(H264Context *h, int setup_finished)
h->sei_reguserdata_afd_present = 0;
}
if (h->a53_caption) {
AVFrameSideData *sd = av_frame_new_side_data(cur->f,
AV_FRAME_DATA_A53_CC,
h->a53_caption_size);
if (!sd)
return;
memcpy(sd->data, h->a53_caption, h->a53_caption_size);
av_freep(&h->a53_caption);
h->a53_caption_size = 0;
}
// FIXME do something with unavailable reference frames
/* Sort B-frames into display order */

2
libavcodec/h264.h
View File

@ -680,6 +680,8 @@ typedef struct H264Context {
*/
int sei_reguserdata_afd_present;
uint8_t active_format_description;
int a53_caption_size;
uint8_t *a53_caption;
/**
* Bit set of clock types for fields/frames in picture timing SEI message.

45
libavcodec/h264_sei.c
View File

@ -43,6 +43,9 @@ void ff_h264_reset_sei(H264Context *h)
h->sei_frame_packing_present = 0;
h->sei_display_orientation_present = 0;
h->sei_reguserdata_afd_present = 0;
h->a53_caption_size = 0;
av_freep(&h->a53_caption);
}
static int decode_picture_timing(H264Context *h)
@ -107,7 +110,7 @@ static int decode_registered_user_data(H264Context *h, int size)
{
uint32_t country_code;
uint32_t user_identifier;
int flag;
int flag, user_data_type_code, cc_count;
if (size < 7)
return AVERROR_INVALIDDATA;
@ -140,6 +143,46 @@ static int decode_registered_user_data(H264Context *h, int size)
h->sei_reguserdata_afd_present = 1;
}
break;
case MKBETAG('G', 'A', '9', '4'): // closed captions
if (size < 3)
return AVERROR(EINVAL);
user_data_type_code = get_bits(&h->gb, 8);
if (user_data_type_code == 0x3) {
skip_bits(&h->gb, 1); // reserved
flag = get_bits(&h->gb, 1); // process_cc_data_flag
if (flag) {
skip_bits(&h->gb, 1); // zero bit
cc_count = get_bits(&h->gb, 5);
skip_bits(&h->gb, 8); // reserved
size -= 2;
if (cc_count && size >= cc_count * 3) {
int i, ret;
int new_size = (int64_t) h->a53_caption_size +
(int64_t) cc_count * 3;
if (new_size > INT_MAX)
return AVERROR(EINVAL);
/* Allow merging of the cc data from two fields. */
ret = av_reallocp(&h->a53_caption,
h->a53_caption_size + cc_count * 3);
if (ret < 0)
return ret;
for (i = 0; i < cc_count; i++) {
h->a53_caption[h->a53_caption_size++] = get_bits(&h->gb, 8);
h->a53_caption[h->a53_caption_size++] = get_bits(&h->gb, 8);
h->a53_caption[h->a53_caption_size++] = get_bits(&h->gb, 8);
}
skip_bits(&h->gb, 8); // marker_bits
}
}
}
break;
default:
skip_bits(&h->gb, size * 8);
break;