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avcodec/mpeg12dec: rename 0x0502 CC format

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The format is used by at least Dish Network, but is not
defined in any DVB standard, so remove references to DVB.

This is a simple rename, no functional change.

Signed-off-by: Marth64 <marth64@proxyid.net>
This commit is contained in:
Scott Theisen 2025-02-02 13:55:03 -05:00 committed by Marth64
parent b37606e562
commit 33daef5f49
1 changed files with 14 additions and 14 deletions
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28
libavcodec/mpeg12dec.c
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@ -67,7 +67,7 @@ enum Mpeg2ClosedCaptionsFormat {
CC_FORMAT_A53_PART4,
CC_FORMAT_SCTE20,
CC_FORMAT_DVD,
CC_FORMAT_DVB_0502
CC_FORMAT_DISH
};
typedef struct Mpeg1Context {
@ -2064,39 +2064,39 @@ static int mpeg_decode_a53_cc(AVCodecContext *avctx,
mpeg_set_cc_format(avctx, CC_FORMAT_DVD, "DVD");
}
return 1;
} else if ((!s1->cc_format || s1->cc_format == CC_FORMAT_DVB_0502) &&
} else if ((!s1->cc_format || s1->cc_format == CC_FORMAT_DISH) &&
buf_size >= 12 &&
p[0] == 0x05 && p[1] == 0x02) {
/* extract DVB 0502 CC data */
/* extract Dish Network CC data */
const uint8_t cc_header = 0xf8 | 0x04 /* valid */ | 0x00 /* line 21 field 1 */;
uint8_t cc_data[4] = {0};
int cc_count = 0;
uint8_t dvb_cc_type = p[7];
uint8_t cc_type = p[7];
p += 8;
buf_size -= 8;
if (dvb_cc_type == 0x05 && buf_size >= 7) {
dvb_cc_type = p[6];
if (cc_type == 0x05 && buf_size >= 7) {
cc_type = p[6];
p += 7;
buf_size -= 7;
}
if (dvb_cc_type == 0x02 && buf_size >= 4) { /* 2-byte caption, can be repeated */
if (cc_type == 0x02 && buf_size >= 4) { /* 2-byte caption, can be repeated */
cc_count = 1;
cc_data[0] = p[1];
cc_data[1] = p[2];
dvb_cc_type = p[3];
cc_type = p[3];
/* Only repeat characters when the next type flag
* is 0x04 and the characters are repeatable (i.e., less than
* 32 with the parity stripped).
*/
if (dvb_cc_type == 0x04 && (cc_data[0] & 0x7f) < 32) {
if (cc_type == 0x04 && (cc_data[0] & 0x7f) < 32) {
cc_count = 2;
cc_data[2] = cc_data[0];
cc_data[3] = cc_data[1];
}
} else if (dvb_cc_type == 0x04 && buf_size >= 5) { /* 4-byte caption, not repeated */
} else if (cc_type == 0x04 && buf_size >= 5) { /* 4-byte caption, not repeated */
cc_count = 2;
cc_data[0] = p[1];
cc_data[1] = p[2];
@ -2124,7 +2124,7 @@ static int mpeg_decode_a53_cc(AVCodecContext *avctx,
}
}
mpeg_set_cc_format(avctx, CC_FORMAT_DVB_0502, "DVB 0502");
mpeg_set_cc_format(avctx, CC_FORMAT_DISH, "Dish Network");
}
return 1;
}
@ -2687,7 +2687,7 @@ const FFCodec ff_mpeg1video_decoder = {
static const AVOption mpeg2video_options[] = {
{ "cc_format", "extract a specific Closed Captions format",
M2V_OFFSET(cc_format), AV_OPT_TYPE_INT, { .i64 = CC_FORMAT_AUTO },
CC_FORMAT_AUTO, CC_FORMAT_DVB_0502, M2V_PARAM, .unit = "cc_format" },
CC_FORMAT_AUTO, CC_FORMAT_DISH, M2V_PARAM, .unit = "cc_format" },
{ "auto", "pick first seen CC substream", 0, AV_OPT_TYPE_CONST,
{ .i64 = CC_FORMAT_AUTO }, .flags = M2V_PARAM, .unit = "cc_format" },
@ -2697,8 +2697,8 @@ static const AVOption mpeg2video_options[] = {
{ .i64 = CC_FORMAT_SCTE20 }, .flags = M2V_PARAM, .unit = "cc_format" },
{ "dvd", "pick DVD CC substream", 0, AV_OPT_TYPE_CONST,
{ .i64 = CC_FORMAT_DVD }, .flags = M2V_PARAM, .unit = "cc_format" },
{ "dvb_0502", "pick DVB 0502 CC substream", 0, AV_OPT_TYPE_CONST,
{ .i64 = CC_FORMAT_DVB_0502 }, .flags = M2V_PARAM, .unit = "cc_format" },
{ "dish", "pick Dish Network CC substream", 0, AV_OPT_TYPE_CONST,
{ .i64 = CC_FORMAT_DISH }, .flags = M2V_PARAM, .unit = "cc_format" },
{ NULL }
};