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avcodec/hevc_sei: support HEVC timecode decode

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Signed-off-by: Limin Wang <lance.lmwang@gmail.com>
This commit is contained in:
Limin Wang 2020-06-15 20:55:17 +08:00
parent acca2aecb0
commit 78f787c2e7
2 changed files with 70 additions and 0 deletions
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49
libavcodec/hevc_sei.c
View File

@ -306,6 +306,53 @@ static int decode_nal_sei_alternative_transfer(HEVCSEIAlternativeTransfer *s, Ge
return 0;
}
static int decode_nal_sei_timecode(HEVCSEITimeCode *s, GetBitContext *gb)
{
s->num_clock_ts = get_bits(gb, 2);
for (int i = 0; i < s->num_clock_ts; i++) {
s->clock_timestamp_flag[i] = get_bits(gb, 1);
if (s->clock_timestamp_flag[i]) {
s->units_field_based_flag[i] = get_bits(gb, 1);
s->counting_type[i] = get_bits(gb, 5);
s->full_timestamp_flag[i] = get_bits(gb, 1);
s->discontinuity_flag[i] = get_bits(gb, 1);
s->cnt_dropped_flag[i] = get_bits(gb, 1);
s->n_frames[i] = get_bits(gb, 9);
if (s->full_timestamp_flag[i]) {
s->seconds_value[i] = av_clip(get_bits(gb, 6), 0, 59);
s->minutes_value[i] = av_clip(get_bits(gb, 6), 0, 59);
s->hours_value[i] = av_clip(get_bits(gb, 5), 0, 23);
} else {
s->seconds_flag[i] = get_bits(gb, 1);
if (s->seconds_flag[i]) {
s->seconds_value[i] = av_clip(get_bits(gb, 6), 0, 59);
s->minutes_flag[i] = get_bits(gb, 1);
if (s->minutes_flag[i]) {
s->minutes_value[i] = av_clip(get_bits(gb, 6), 0, 59);
s->hours_flag[i] = get_bits(gb, 1);
if (s->hours_flag[i]) {
s->hours_value[i] = av_clip(get_bits(gb, 5), 0, 23);
}
}
}
}
s->time_offset_length[i] = get_bits(gb, 5);
if (s->time_offset_length[i] > 0) {
s->time_offset_value[i] = get_bits(gb, s->time_offset_length[i]);
}
}
}
s->present = 1;
return 0;
}
static int decode_nal_sei_prefix(GetBitContext *gb, void *logctx, HEVCSEI *s,
const HEVCParamSets *ps, int type, int size)
{
@ -330,6 +377,8 @@ static int decode_nal_sei_prefix(GetBitContext *gb, void *logctx, HEVCSEI *s,
return decode_nal_sei_user_data_unregistered(&s->unregistered, gb, size);
case HEVC_SEI_TYPE_ALTERNATIVE_TRANSFER_CHARACTERISTICS:
return decode_nal_sei_alternative_transfer(&s->alternative_transfer, gb);
case HEVC_SEI_TYPE_TIME_CODE:
return decode_nal_sei_timecode(&s->timecode, gb);
default:
av_log(logctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", type);
skip_bits_long(gb, 8 * size);

21
libavcodec/hevc_sei.h
View File

@ -115,6 +115,26 @@ typedef struct HEVCSEIAlternativeTransfer {
int preferred_transfer_characteristics;
} HEVCSEIAlternativeTransfer;
typedef struct HEVCSEITimeCode {
int present;
uint8_t num_clock_ts;
uint8_t clock_timestamp_flag[3];
uint8_t units_field_based_flag[3];
uint8_t counting_type[3];
uint8_t full_timestamp_flag[3];
uint8_t discontinuity_flag[3];
uint8_t cnt_dropped_flag[3];
uint16_t n_frames[3];
uint8_t seconds_value[3];
uint8_t minutes_value[3];
uint8_t hours_value[3];
uint8_t seconds_flag[3];
uint8_t minutes_flag[3];
uint8_t hours_flag[3];
uint8_t time_offset_length[3];
int32_t time_offset_value[3];
} HEVCSEITimeCode;
typedef struct HEVCSEI {
HEVCSEIPictureHash picture_hash;
HEVCSEIFramePacking frame_packing;
@ -126,6 +146,7 @@ typedef struct HEVCSEI {
HEVCSEIContentLight content_light;
int active_seq_parameter_set_id;
HEVCSEIAlternativeTransfer alternative_transfer;
HEVCSEITimeCode timecode;
} HEVCSEI;
struct HEVCParamSets;