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avformat/hevc: add a function to write a lhvC box

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Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2024-06-15 14:50:03 -03:00
parent cee43e512d
commit cbfbacff20
2 changed files with 145 additions and 35 deletions
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163
libavformat/hevc.c
View File

@ -43,12 +43,16 @@ enum {
#define FLAG_ARRAY_COMPLETENESS (1 << 0)
#define FLAG_IS_NALFF (1 << 1)
#define FLAG_IS_LHVC (1 << 2)
typedef struct HVCCNALUnit {
uint8_t nuh_layer_id;
uint8_t parameter_set_id;
uint16_t nalUnitLength;
const uint8_t *nalUnit;
// VPS
uint8_t vps_max_sub_layers_minus1;
} HVCCNALUnit;
typedef struct HVCCNALUnitArray {
@ -383,8 +387,6 @@ static void skip_sub_layer_ordering_info(GetBitContext *gb)
static int hvcc_parse_vps(GetBitContext *gb, HVCCNALUnit *nal,
HEVCDecoderConfigurationRecord *hvcc)
{
unsigned int vps_max_sub_layers_minus1;
nal->parameter_set_id = get_bits(gb, 4);
/*
* vps_reserved_three_2bits u(2)
@ -392,7 +394,7 @@ static int hvcc_parse_vps(GetBitContext *gb, HVCCNALUnit *nal,
*/
skip_bits(gb, 8);
vps_max_sub_layers_minus1 = get_bits(gb, 3);
nal->vps_max_sub_layers_minus1 = get_bits(gb, 3);
/*
* numTemporalLayers greater than 1 indicates that the stream to which this
@ -403,7 +405,7 @@ static int hvcc_parse_vps(GetBitContext *gb, HVCCNALUnit *nal,
* that it is unknown whether the stream is temporally scalable.
*/
hvcc->numTemporalLayers = FFMAX(hvcc->numTemporalLayers,
vps_max_sub_layers_minus1 + 1);
nal->vps_max_sub_layers_minus1 + 1);
/*
* vps_temporal_id_nesting_flag u(1)
@ -411,7 +413,7 @@ static int hvcc_parse_vps(GetBitContext *gb, HVCCNALUnit *nal,
*/
skip_bits(gb, 17);
hvcc_parse_ptl(gb, hvcc, vps_max_sub_layers_minus1);
hvcc_parse_ptl(gb, hvcc, nal->vps_max_sub_layers_minus1);
/* nothing useful for hvcC past this point */
return 0;
@ -508,10 +510,33 @@ static int hvcc_parse_sps(GetBitContext *gb, HVCCNALUnit *nal,
{
unsigned int i, sps_max_sub_layers_minus1, log2_max_pic_order_cnt_lsb_minus4;
unsigned int num_short_term_ref_pic_sets, num_delta_pocs[HEVC_MAX_SHORT_TERM_REF_PIC_SETS];
unsigned int sps_ext_or_max_sub_layers_minus1, multi_layer_ext_sps_flag;
skip_bits(gb, 4); // sps_video_parameter_set_id
unsigned int sps_video_parameter_set_id = get_bits(gb, 4);
sps_max_sub_layers_minus1 = get_bits (gb, 3);
if (nal->nuh_layer_id == 0) {
sps_ext_or_max_sub_layers_minus1 = 0;
sps_max_sub_layers_minus1 = get_bits(gb, 3);
} else {
sps_ext_or_max_sub_layers_minus1 = get_bits(gb, 3);
if (sps_ext_or_max_sub_layers_minus1 == 7) {
const HVCCNALUnitArray *array = &hvcc->arrays[VPS_INDEX];
const HVCCNALUnit *vps = NULL;
for (i = 0; i < array->numNalus; i++)
if (sps_video_parameter_set_id == array->nal[i].parameter_set_id) {
vps = &array->nal[i];
break;
}
if (!vps)
return AVERROR_INVALIDDATA;
sps_max_sub_layers_minus1 = vps->vps_max_sub_layers_minus1;
} else
sps_max_sub_layers_minus1 = sps_ext_or_max_sub_layers_minus1;
}
multi_layer_ext_sps_flag = nal->nuh_layer_id &&
sps_ext_or_max_sub_layers_minus1 == 7;
/*
* numTemporalLayers greater than 1 indicates that the stream to which this
@ -524,12 +549,17 @@ static int hvcc_parse_sps(GetBitContext *gb, HVCCNALUnit *nal,
hvcc->numTemporalLayers = FFMAX(hvcc->numTemporalLayers,
sps_max_sub_layers_minus1 + 1);
hvcc->temporalIdNested = get_bits1(gb);
hvcc_parse_ptl(gb, hvcc, sps_max_sub_layers_minus1);
if (!multi_layer_ext_sps_flag) {
hvcc->temporalIdNested = get_bits1(gb);
hvcc_parse_ptl(gb, hvcc, sps_max_sub_layers_minus1);
}
nal->parameter_set_id = get_ue_golomb_long(gb);
if (multi_layer_ext_sps_flag) {
if (get_bits1(gb)) // update_rep_format_flag
skip_bits(gb, 8); // sps_rep_format_idx
} else {
hvcc->chromaFormat = get_ue_golomb_long(gb);
if (hvcc->chromaFormat == 3)
@ -547,12 +577,15 @@ static int hvcc_parse_sps(GetBitContext *gb, HVCCNALUnit *nal,
hvcc->bitDepthLumaMinus8 = get_ue_golomb_long(gb);
hvcc->bitDepthChromaMinus8 = get_ue_golomb_long(gb);
}
log2_max_pic_order_cnt_lsb_minus4 = get_ue_golomb_long(gb);
if (!multi_layer_ext_sps_flag) {
/* sps_sub_layer_ordering_info_present_flag */
i = get_bits1(gb) ? 0 : sps_max_sub_layers_minus1;
for (; i <= sps_max_sub_layers_minus1; i++)
skip_sub_layer_ordering_info(gb);
}
get_ue_golomb_long(gb); // log2_min_luma_coding_block_size_minus3
get_ue_golomb_long(gb); // log2_diff_max_min_luma_coding_block_size
@ -561,9 +594,15 @@ static int hvcc_parse_sps(GetBitContext *gb, HVCCNALUnit *nal,
get_ue_golomb_long(gb); // max_transform_hierarchy_depth_inter
get_ue_golomb_long(gb); // max_transform_hierarchy_depth_intra
if (get_bits1(gb) && // scaling_list_enabled_flag
get_bits1(gb)) // sps_scaling_list_data_present_flag
skip_scaling_list_data(gb);
if (get_bits1(gb)) { // scaling_list_enabled_flag
int sps_infer_scaling_list_flag = 0;
if (multi_layer_ext_sps_flag)
sps_infer_scaling_list_flag = get_bits1(gb);
if (sps_infer_scaling_list_flag)
skip_bits(gb, 6); // sps_scaling_list_ref_layer_id
else if (get_bits1(gb)) // sps_scaling_list_data_present_flag
skip_scaling_list_data(gb);
}
skip_bits1(gb); // amp_enabled_flag
skip_bits1(gb); // sample_adaptive_offset_enabled_flag
@ -703,6 +742,7 @@ static int hvcc_add_nal_unit(const uint8_t *nal_buf, uint32_t nal_size,
{
int ret = 0;
int is_nalff = !!(flags & FLAG_IS_NALFF);
int is_lhvc = !!(flags & FLAG_IS_LHVC);
int ps_array_completeness = !!(flags & FLAG_ARRAY_COMPLETENESS);
HVCCNALUnitArray *const array = &hvcc->arrays[array_idx];
HVCCNALUnit *nal;
@ -722,7 +762,7 @@ static int hvcc_add_nal_unit(const uint8_t *nal_buf, uint32_t nal_size,
goto end;
nal_unit_parse_header(&gbc, &nal_type, &nuh_layer_id);
if (nuh_layer_id > 0)
if (!is_lhvc && nuh_layer_id > 0)
goto end;
/*
@ -798,9 +838,12 @@ static void hvcc_close(HEVCDecoderConfigurationRecord *hvcc)
}
}
static int hvcc_write(AVIOContext *pb, HEVCDecoderConfigurationRecord *hvcc)
static int hvcc_write(AVIOContext *pb, HEVCDecoderConfigurationRecord *hvcc,
int flags)
{
uint16_t vps_count, sps_count, pps_count;
uint16_t numNalus[NB_ARRAYS] = { 0 };
int is_lhvc = !!(flags & FLAG_IS_LHVC);
int numOfArrays = 0;
/*
* We only support writing HEVCDecoderConfigurationRecord version 1.
@ -826,10 +869,32 @@ static int hvcc_write(AVIOContext *pb, HEVCDecoderConfigurationRecord *hvcc)
* let's always set them to values meaning 'unspecified'.
*/
hvcc->avgFrameRate = 0;
hvcc->constantFrameRate = 0;
/*
* lhvC doesn't store this field. It instead reserves the bits, setting them
* to '11'b.
*/
hvcc->constantFrameRate = is_lhvc * 0x3;
/*
* Skip all NALUs with nuh_layer_id == 0 if writing lhvC. We do it here and
* not before parsing them as some parameter sets with nuh_layer_id > 0
* may reference base layer parameters sets.
*/
for (unsigned i = 0; i < FF_ARRAY_ELEMS(hvcc->arrays); i++) {
const HVCCNALUnitArray *const array = &hvcc->arrays[i];
if (array->numNalus == 0)
continue;
for (unsigned j = 0; j < array->numNalus; j++)
numNalus[i] += !is_lhvc || (array->nal[j].nuh_layer_id != 0);
numOfArrays += (numNalus[i] > 0);
}
av_log(NULL, AV_LOG_TRACE, "%s\n", is_lhvc ? "lhvC" : "hvcC");
av_log(NULL, AV_LOG_TRACE, "configurationVersion: %"PRIu8"\n",
hvcc->configurationVersion);
if (!is_lhvc) {
av_log(NULL, AV_LOG_TRACE, "general_profile_space: %"PRIu8"\n",
hvcc->general_profile_space);
av_log(NULL, AV_LOG_TRACE, "general_tier_flag: %"PRIu8"\n",
@ -842,10 +907,12 @@ static int hvcc_write(AVIOContext *pb, HEVCDecoderConfigurationRecord *hvcc)
hvcc->general_constraint_indicator_flags);
av_log(NULL, AV_LOG_TRACE, "general_level_idc: %"PRIu8"\n",
hvcc->general_level_idc);
}
av_log(NULL, AV_LOG_TRACE, "min_spatial_segmentation_idc: %"PRIu16"\n",
hvcc->min_spatial_segmentation_idc);
av_log(NULL, AV_LOG_TRACE, "parallelismType: %"PRIu8"\n",
hvcc->parallelismType);
if (!is_lhvc) {
av_log(NULL, AV_LOG_TRACE, "chromaFormat: %"PRIu8"\n",
hvcc->chromaFormat);
av_log(NULL, AV_LOG_TRACE, "bitDepthLumaMinus8: %"PRIu8"\n",
@ -856,6 +923,7 @@ static int hvcc_write(AVIOContext *pb, HEVCDecoderConfigurationRecord *hvcc)
hvcc->avgFrameRate);
av_log(NULL, AV_LOG_TRACE, "constantFrameRate: %"PRIu8"\n",
hvcc->constantFrameRate);
}
av_log(NULL, AV_LOG_TRACE, "numTemporalLayers: %"PRIu8"\n",
hvcc->numTemporalLayers);
av_log(NULL, AV_LOG_TRACE, "temporalIdNested: %"PRIu8"\n",
@ -863,11 +931,11 @@ static int hvcc_write(AVIOContext *pb, HEVCDecoderConfigurationRecord *hvcc)
av_log(NULL, AV_LOG_TRACE, "lengthSizeMinusOne: %"PRIu8"\n",
hvcc->lengthSizeMinusOne);
av_log(NULL, AV_LOG_TRACE, "numOfArrays: %"PRIu8"\n",
hvcc->numOfArrays);
numOfArrays);
for (unsigned i = 0, j = 0; i < FF_ARRAY_ELEMS(hvcc->arrays); i++) {
const HVCCNALUnitArray *const array = &hvcc->arrays[i];
if (array->numNalus == 0)
if (numNalus[i] == 0)
continue;
av_log(NULL, AV_LOG_TRACE, "array_completeness[%u]: %"PRIu8"\n",
@ -875,28 +943,31 @@ static int hvcc_write(AVIOContext *pb, HEVCDecoderConfigurationRecord *hvcc)
av_log(NULL, AV_LOG_TRACE, "NAL_unit_type[%u]: %"PRIu8"\n",
j, array->NAL_unit_type);
av_log(NULL, AV_LOG_TRACE, "numNalus[%u]: %"PRIu16"\n",
j, array->numNalus);
for (unsigned k = 0; k < array->numNalus; k++)
j, numNalus[i]);
for (unsigned k = 0; k < array->numNalus; k++) {
if (is_lhvc && array->nal[k].nuh_layer_id == 0)
continue;
av_log(NULL, AV_LOG_TRACE,
"nalUnitLength[%u][%u]: %"PRIu16"\n",
j, k, array->nal[k].nalUnitLength);
}
j++;
}
/*
* We need at least one of each: VPS, SPS and PPS.
*/
vps_count = hvcc->arrays[VPS_INDEX].numNalus;
sps_count = hvcc->arrays[SPS_INDEX].numNalus;
pps_count = hvcc->arrays[PPS_INDEX].numNalus;
if (!vps_count || vps_count > HEVC_MAX_VPS_COUNT ||
!sps_count || sps_count > HEVC_MAX_SPS_COUNT ||
!pps_count || pps_count > HEVC_MAX_PPS_COUNT)
if ((!numNalus[VPS_INDEX] || numNalus[VPS_INDEX] > HEVC_MAX_VPS_COUNT) && !is_lhvc)
return AVERROR_INVALIDDATA;
if (!numNalus[SPS_INDEX] || numNalus[SPS_INDEX] > HEVC_MAX_SPS_COUNT ||
!numNalus[PPS_INDEX] || numNalus[PPS_INDEX] > HEVC_MAX_PPS_COUNT)
return AVERROR_INVALIDDATA;
/* unsigned int(8) configurationVersion = 1; */
avio_w8(pb, hvcc->configurationVersion);
if (!is_lhvc) {
/*
* unsigned int(2) general_profile_space;
* unsigned int(1) general_tier_flag;
@ -915,6 +986,7 @@ static int hvcc_write(AVIOContext *pb, HEVCDecoderConfigurationRecord *hvcc)
/* unsigned int(8) general_level_idc; */
avio_w8(pb, hvcc->general_level_idc);
}
/*
* bit(4) reserved = '1111'b;
@ -928,6 +1000,7 @@ static int hvcc_write(AVIOContext *pb, HEVCDecoderConfigurationRecord *hvcc)
*/
avio_w8(pb, hvcc->parallelismType | 0xfc);
if (!is_lhvc) {
/*
* bit(6) reserved = '111111'b;
* unsigned int(2) chromaFormat;
@ -948,9 +1021,13 @@ static int hvcc_write(AVIOContext *pb, HEVCDecoderConfigurationRecord *hvcc)
/* bit(16) avgFrameRate; */
avio_wb16(pb, hvcc->avgFrameRate);
}
/*
* if (!is_lhvc)
* bit(2) constantFrameRate;
* else
* bit(2) reserved = '11'b;
* bit(3) numTemporalLayers;
* bit(1) temporalIdNested;
* unsigned int(2) lengthSizeMinusOne;
@ -961,12 +1038,12 @@ static int hvcc_write(AVIOContext *pb, HEVCDecoderConfigurationRecord *hvcc)
hvcc->lengthSizeMinusOne);
/* unsigned int(8) numOfArrays; */
avio_w8(pb, hvcc->numOfArrays);
avio_w8(pb, numOfArrays);
for (unsigned i = 0; i < FF_ARRAY_ELEMS(hvcc->arrays); i++) {
const HVCCNALUnitArray *const array = &hvcc->arrays[i];
if (!array->numNalus)
if (!numNalus[i])
continue;
/*
* bit(1) array_completeness;
@ -977,11 +1054,14 @@ static int hvcc_write(AVIOContext *pb, HEVCDecoderConfigurationRecord *hvcc)
array->NAL_unit_type & 0x3f);
/* unsigned int(16) numNalus; */
avio_wb16(pb, array->numNalus);
avio_wb16(pb, numNalus[i]);
for (unsigned j = 0; j < array->numNalus; j++) {
HVCCNALUnit *nal = &array->nal[j];
if (is_lhvc && nal->nuh_layer_id == 0)
continue;
/* unsigned int(16) nalUnitLength; */
avio_wb16(pb, nal->nalUnitLength);
@ -1082,12 +1162,11 @@ static int hvcc_parse_nal_unit(const uint8_t *buf, uint32_t len, int type,
return 0;
}
int ff_isom_write_hvcc(AVIOContext *pb, const uint8_t *data,
int size, int ps_array_completeness)
static int write_configuration_record(AVIOContext *pb, const uint8_t *data,
int size, int flags)
{
HEVCDecoderConfigurationRecord hvcc;
uint8_t *buf, *end, *start = NULL;
int flags = !!ps_array_completeness * FLAG_ARRAY_COMPLETENESS;
int ret;
if (size < 6) {
@ -1154,7 +1233,7 @@ int ff_isom_write_hvcc(AVIOContext *pb, const uint8_t *data,
}
}
ret = hvcc_write(pb, &hvcc);
ret = hvcc_write(pb, &hvcc, flags);
goto end;
} else if (!(AV_RB24(data) == 1 || AV_RB32(data) == 1)) {
/* Not a valid Annex B start code prefix */
@ -1183,10 +1262,24 @@ int ff_isom_write_hvcc(AVIOContext *pb, const uint8_t *data,
buf += len;
}
ret = hvcc_write(pb, &hvcc);
ret = hvcc_write(pb, &hvcc, flags);
end:
hvcc_close(&hvcc);
av_free(start);
return ret;
}
int ff_isom_write_hvcc(AVIOContext *pb, const uint8_t *data,
int size, int ps_array_completeness)
{
return write_configuration_record(pb, data, size,
!!ps_array_completeness * FLAG_ARRAY_COMPLETENESS);
}
int ff_isom_write_lhvc(AVIOContext *pb, const uint8_t *data,
int size, int ps_array_completeness)
{
return write_configuration_record(pb, data, size,
(!!ps_array_completeness * FLAG_ARRAY_COMPLETENESS) | FLAG_IS_LHVC);
}

17
libavformat/hevc.h
View File

@ -97,4 +97,21 @@ int ff_hevc_annexb2mp4_buf(const uint8_t *buf_in, uint8_t **buf_out,
int ff_isom_write_hvcc(AVIOContext *pb, const uint8_t *data,
int size, int ps_array_completeness);
/**
* Writes L-HEVC extradata (parameter sets with nuh_layer_id > 0, as a
* LHEVCDecoderConfigurationRecord) to the provided AVIOContext.
*
* If the extradata is Annex B format, it gets converted to lhvC format before
* writing. Otherwise, hvcC formated extradata is expected, not lhvC.
*
* @param pb address of the AVIOContext where the lhvC shall be written
* @param data address of the buffer holding the data needed to write the lhvC
* @param size size (in bytes) of the data buffer
* @param ps_array_completeness whether all parameter sets are in the lhvC (1)
* or there may be additional parameter sets in the bitstream (0)
* @return >=0 in case of success, a negative value corresponding to an AVERROR
* code in case of failure
*/
int ff_isom_write_lhvc(AVIOContext *pb, const uint8_t *data,
int size, int ps_array_completeness);
#endif /* AVFORMAT_HEVC_H */