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7a20656474
FFmpeg/libavcodec/cbs_h2645.c
Mark Thompson 7a20656474 cbs_h265: Add a lot more SEI parsing support 
Supports both prefix and suffix SEI, decoding all of the common SEI
types and some more obscure ones.  Most of this is tested by the
existing tests in fate.
2018-11-18 17:33:26 +00:00

1655 lines
49 KiB
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/*
* 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 "libavutil/attributes.h"
#include "libavutil/avassert.h"
#include "bytestream.h"
#include "cbs.h"
#include "cbs_internal.h"
#include "cbs_h264.h"
#include "cbs_h265.h"
#include "golomb.h"
#include "h264.h"
#include "h264_sei.h"
#include "h2645_parse.h"
#include "hevc.h"
#include "hevc_sei.h"
static int cbs_read_ue_golomb(CodedBitstreamContext *ctx, GetBitContext *gbc,
const char *name, const int *subscripts,
uint32_t *write_to,
uint32_t range_min, uint32_t range_max)
{
uint32_t value;
int position, i, j;
unsigned int k;
char bits[65];
position = get_bits_count(gbc);
for (i = 0; i < 32; i++) {
if (get_bits_left(gbc) < i + 1) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid ue-golomb code at "
"%s: bitstream ended.\n", name);
return AVERROR_INVALIDDATA;
}
k = get_bits1(gbc);
bits[i] = k ? '1' : '0';
if (k)
break;
}
if (i >= 32) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid ue-golomb code at "
"%s: more than 31 zeroes.\n", name);
return AVERROR_INVALIDDATA;
}
value = 1;
for (j = 0; j < i; j++) {
k = get_bits1(gbc);
bits[i + j + 1] = k ? '1' : '0';
value = value << 1 | k;
}
bits[i + j + 1] = 0;
--value;
if (ctx->trace_enable)
ff_cbs_trace_syntax_element(ctx, position, name, subscripts,
bits, value);
if (value < range_min || value > range_max) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
"%"PRIu32", but must be in [%"PRIu32",%"PRIu32"].\n",
name, value, range_min, range_max);
return AVERROR_INVALIDDATA;
}
*write_to = value;
return 0;
}
static int cbs_read_se_golomb(CodedBitstreamContext *ctx, GetBitContext *gbc,
const char *name, const int *subscripts,
int32_t *write_to,
int32_t range_min, int32_t range_max)
{
int32_t value;
int position, i, j;
unsigned int k;
uint32_t v;
char bits[65];
position = get_bits_count(gbc);
for (i = 0; i < 32; i++) {
if (get_bits_left(gbc) < i + 1) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid se-golomb code at "
"%s: bitstream ended.\n", name);
return AVERROR_INVALIDDATA;
}
k = get_bits1(gbc);
bits[i] = k ? '1' : '0';
if (k)
break;
}
if (i >= 32) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid se-golomb code at "
"%s: more than 31 zeroes.\n", name);
return AVERROR_INVALIDDATA;
}
v = 1;
for (j = 0; j < i; j++) {
k = get_bits1(gbc);
bits[i + j + 1] = k ? '1' : '0';
v = v << 1 | k;
}
bits[i + j + 1] = 0;
if (v & 1)
value = -(int32_t)(v / 2);
else
value = v / 2;
if (ctx->trace_enable)
ff_cbs_trace_syntax_element(ctx, position, name, subscripts,
bits, value);
if (value < range_min || value > range_max) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
"%"PRId32", but must be in [%"PRId32",%"PRId32"].\n",
name, value, range_min, range_max);
return AVERROR_INVALIDDATA;
}
*write_to = value;
return 0;
}
static int cbs_write_ue_golomb(CodedBitstreamContext *ctx, PutBitContext *pbc,
const char *name, const int *subscripts,
uint32_t value,
uint32_t range_min, uint32_t range_max)
{
int len;
if (value < range_min || value > range_max) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
"%"PRIu32", but must be in [%"PRIu32",%"PRIu32"].\n",
name, value, range_min, range_max);
return AVERROR_INVALIDDATA;
}
av_assert0(value != UINT32_MAX);
len = av_log2(value + 1);
if (put_bits_left(pbc) < 2 * len + 1)
return AVERROR(ENOSPC);
if (ctx->trace_enable) {
char bits[65];
int i;
for (i = 0; i < len; i++)
bits[i] = '0';
bits[len] = '1';
for (i = 0; i < len; i++)
bits[len + i + 1] = (value + 1) >> (len - i - 1) & 1 ? '1' : '0';
bits[len + len + 1] = 0;
ff_cbs_trace_syntax_element(ctx, put_bits_count(pbc),
name, subscripts, bits, value);
}
put_bits(pbc, len, 0);
if (len + 1 < 32)
put_bits(pbc, len + 1, value + 1);
else
put_bits32(pbc, value + 1);
return 0;
}
static int cbs_write_se_golomb(CodedBitstreamContext *ctx, PutBitContext *pbc,
const char *name, const int *subscripts,
int32_t value,
int32_t range_min, int32_t range_max)
{
int len;
uint32_t uvalue;
if (value < range_min || value > range_max) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
"%"PRId32", but must be in [%"PRId32",%"PRId32"].\n",
name, value, range_min, range_max);
return AVERROR_INVALIDDATA;
}
av_assert0(value != INT32_MIN);
if (value == 0)
uvalue = 0;
else if (value > 0)
uvalue = 2 * (uint32_t)value - 1;
else
uvalue = 2 * (uint32_t)-value;
len = av_log2(uvalue + 1);
if (put_bits_left(pbc) < 2 * len + 1)
return AVERROR(ENOSPC);
if (ctx->trace_enable) {
char bits[65];
int i;
for (i = 0; i < len; i++)
bits[i] = '0';
bits[len] = '1';
for (i = 0; i < len; i++)
bits[len + i + 1] = (uvalue + 1) >> (len - i - 1) & 1 ? '1' : '0';
bits[len + len + 1] = 0;
ff_cbs_trace_syntax_element(ctx, put_bits_count(pbc),
name, subscripts, bits, value);
}
put_bits(pbc, len, 0);
if (len + 1 < 32)
put_bits(pbc, len + 1, uvalue + 1);
else
put_bits32(pbc, uvalue + 1);
return 0;
}
#define HEADER(name) do { \
ff_cbs_trace_header(ctx, name); \
} while (0)
#define CHECK(call) do { \
err = (call); \
if (err < 0) \
return err; \
} while (0)
#define FUNC_NAME(rw, codec, name) cbs_ ## codec ## _ ## rw ## _ ## name
#define FUNC_H264(rw, name) FUNC_NAME(rw, h264, name)
#define FUNC_H265(rw, name) FUNC_NAME(rw, h265, name)
#define SUBSCRIPTS(subs, ...) (subs > 0 ? ((int[subs + 1]){ subs, __VA_ARGS__ }) : NULL)
#define u(width, name, range_min, range_max) \
xu(width, name, current->name, range_min, range_max, 0)
#define flag(name) u(1, name, 0, 1)
#define ue(name, range_min, range_max) \
xue(name, current->name, range_min, range_max, 0)
#define se(name, range_min, range_max) \
xse(name, current->name, range_min, range_max, 0)
#define us(width, name, range_min, range_max, subs, ...) \
xu(width, name, current->name, range_min, range_max, subs, __VA_ARGS__)
#define flags(name, subs, ...) \
xu(1, name, current->name, 0, 1, subs, __VA_ARGS__)
#define ues(name, range_min, range_max, subs, ...) \
xue(name, current->name, range_min, range_max, subs, __VA_ARGS__)
#define ses(name, range_min, range_max, subs, ...) \
xse(name, current->name, range_min, range_max, subs, __VA_ARGS__)
#define fixed(width, name, value) do { \
av_unused uint32_t fixed_value = value; \
xu(width, name, fixed_value, value, value, 0); \
} while (0)
#define READ
#define READWRITE read
#define RWContext GetBitContext
#define xu(width, name, var, range_min, range_max, subs, ...) do { \
uint32_t value = range_min; \
CHECK(ff_cbs_read_unsigned(ctx, rw, width, #name, \
SUBSCRIPTS(subs, __VA_ARGS__), \
&value, range_min, range_max)); \
var = value; \
} while (0)
#define xue(name, var, range_min, range_max, subs, ...) do { \
uint32_t value = range_min; \
CHECK(cbs_read_ue_golomb(ctx, rw, #name, \
SUBSCRIPTS(subs, __VA_ARGS__), \
&value, range_min, range_max)); \
var = value; \
} while (0)
#define xse(name, var, range_min, range_max, subs, ...) do { \
int32_t value = range_min; \
CHECK(cbs_read_se_golomb(ctx, rw, #name, \
SUBSCRIPTS(subs, __VA_ARGS__), \
&value, range_min, range_max)); \
var = value; \
} while (0)
#define infer(name, value) do { \
current->name = value; \
} while (0)
static int cbs_h2645_read_more_rbsp_data(GetBitContext *gbc)
{
int bits_left = get_bits_left(gbc);
if (bits_left > 8)
return 1;
if (show_bits(gbc, bits_left) == 1 << (bits_left - 1))
return 0;
return 1;
}
#define more_rbsp_data(var) ((var) = cbs_h2645_read_more_rbsp_data(rw))
#define byte_alignment(rw) (get_bits_count(rw) % 8)
#define allocate(name, size) do { \
name ## _ref = av_buffer_allocz(size + \
AV_INPUT_BUFFER_PADDING_SIZE); \
if (!name ## _ref) \
return AVERROR(ENOMEM); \
name = name ## _ref->data; \
} while (0)
#define FUNC(name) FUNC_H264(READWRITE, name)
#include "cbs_h264_syntax_template.c"
#undef FUNC
#define FUNC(name) FUNC_H265(READWRITE, name)
#include "cbs_h265_syntax_template.c"
#undef FUNC
#undef READ
#undef READWRITE
#undef RWContext
#undef xu
#undef xue
#undef xse
#undef infer
#undef more_rbsp_data
#undef byte_alignment
#undef allocate
#define WRITE
#define READWRITE write
#define RWContext PutBitContext
#define xu(width, name, var, range_min, range_max, subs, ...) do { \
uint32_t value = var; \
CHECK(ff_cbs_write_unsigned(ctx, rw, width, #name, \
SUBSCRIPTS(subs, __VA_ARGS__), \
value, range_min, range_max)); \
} while (0)
#define xue(name, var, range_min, range_max, subs, ...) do { \
uint32_t value = var; \
CHECK(cbs_write_ue_golomb(ctx, rw, #name, \
SUBSCRIPTS(subs, __VA_ARGS__), \
value, range_min, range_max)); \
} while (0)
#define xse(name, var, range_min, range_max, subs, ...) do { \
int32_t value = var; \
CHECK(cbs_write_se_golomb(ctx, rw, #name, \
SUBSCRIPTS(subs, __VA_ARGS__), \
value, range_min, range_max)); \
} while (0)
#define infer(name, value) do { \
if (current->name != (value)) { \
av_log(ctx->log_ctx, AV_LOG_WARNING, "Warning: " \
"%s does not match inferred value: " \
"%"PRId64", but should be %"PRId64".\n", \
#name, (int64_t)current->name, (int64_t)(value)); \
} \
} while (0)
#define more_rbsp_data(var) (var)
#define byte_alignment(rw) (put_bits_count(rw) % 8)
#define allocate(name, size) do { \
if (!name) { \
av_log(ctx->log_ctx, AV_LOG_ERROR, "%s must be set " \
"for writing.\n", #name); \
return AVERROR_INVALIDDATA; \
} \
} while (0)
#define FUNC(name) FUNC_H264(READWRITE, name)
#include "cbs_h264_syntax_template.c"
#undef FUNC
#define FUNC(name) FUNC_H265(READWRITE, name)
#include "cbs_h265_syntax_template.c"
#undef FUNC
#undef WRITE
#undef READWRITE
#undef RWContext
#undef xu
#undef xue
#undef xse
#undef u
#undef flag
#undef ue
#undef se
#undef infer
#undef more_rbsp_data
#undef byte_alignment
#undef allocate
static void cbs_h264_free_pps(void *unit, uint8_t *content)
{
H264RawPPS *pps = (H264RawPPS*)content;
av_buffer_unref(&pps->slice_group_id_ref);
av_freep(&content);
}
static void cbs_h264_free_sei_payload(H264RawSEIPayload *payload)
{
switch (payload->payload_type) {
case H264_SEI_TYPE_BUFFERING_PERIOD:
case H264_SEI_TYPE_PIC_TIMING:
case H264_SEI_TYPE_PAN_SCAN_RECT:
case H264_SEI_TYPE_RECOVERY_POINT:
case H264_SEI_TYPE_DISPLAY_ORIENTATION:
case H264_SEI_TYPE_MASTERING_DISPLAY_COLOUR_VOLUME:
break;
case H264_SEI_TYPE_USER_DATA_REGISTERED:
av_buffer_unref(&payload->payload.user_data_registered.data_ref);
break;
case H264_SEI_TYPE_USER_DATA_UNREGISTERED:
av_buffer_unref(&payload->payload.user_data_unregistered.data_ref);
break;
default:
av_buffer_unref(&payload->payload.other.data_ref);
break;
}
}
static void cbs_h264_free_sei(void *unit, uint8_t *content)
{
H264RawSEI *sei = (H264RawSEI*)content;
int i;
for (i = 0; i < sei->payload_count; i++)
cbs_h264_free_sei_payload(&sei->payload[i]);
av_freep(&content);
}
static void cbs_h264_free_slice(void *unit, uint8_t *content)
{
H264RawSlice *slice = (H264RawSlice*)content;
av_buffer_unref(&slice->data_ref);
av_freep(&content);
}
static void cbs_h265_free_vps(void *unit, uint8_t *content)
{
H265RawVPS *vps = (H265RawVPS*)content;
av_buffer_unref(&vps->extension_data.data_ref);
av_freep(&content);
}
static void cbs_h265_free_sps(void *unit, uint8_t *content)
{
H265RawSPS *sps = (H265RawSPS*)content;
av_buffer_unref(&sps->extension_data.data_ref);
av_freep(&content);
}
static void cbs_h265_free_pps(void *unit, uint8_t *content)
{
H265RawPPS *pps = (H265RawPPS*)content;
av_buffer_unref(&pps->extension_data.data_ref);
av_freep(&content);
}
static void cbs_h265_free_slice(void *unit, uint8_t *content)
{
H265RawSlice *slice = (H265RawSlice*)content;
av_buffer_unref(&slice->data_ref);
av_freep(&content);
}
static void cbs_h265_free_sei_payload(H265RawSEIPayload *payload)
{
switch (payload->payload_type) {
case HEVC_SEI_TYPE_BUFFERING_PERIOD:
case HEVC_SEI_TYPE_PICTURE_TIMING:
case HEVC_SEI_TYPE_PAN_SCAN_RECT:
case HEVC_SEI_TYPE_RECOVERY_POINT:
case HEVC_SEI_TYPE_DISPLAY_ORIENTATION:
case HEVC_SEI_TYPE_ACTIVE_PARAMETER_SETS:
case HEVC_SEI_TYPE_DECODED_PICTURE_HASH:
case HEVC_SEI_TYPE_TIME_CODE:
case HEVC_SEI_TYPE_MASTERING_DISPLAY_INFO:
case HEVC_SEI_TYPE_CONTENT_LIGHT_LEVEL_INFO:
case HEVC_SEI_TYPE_ALTERNATIVE_TRANSFER_CHARACTERISTICS:
break;
case HEVC_SEI_TYPE_USER_DATA_REGISTERED_ITU_T_T35:
av_buffer_unref(&payload->payload.user_data_registered.data_ref);
break;
case HEVC_SEI_TYPE_USER_DATA_UNREGISTERED:
av_buffer_unref(&payload->payload.user_data_unregistered.data_ref);
break;
default:
av_buffer_unref(&payload->payload.other.data_ref);
break;
}
}
static void cbs_h265_free_sei(void *unit, uint8_t *content)
{
H265RawSEI *sei = (H265RawSEI*)content;
int i;
for (i = 0; i < sei->payload_count; i++)
cbs_h265_free_sei_payload(&sei->payload[i]);
av_freep(&content);
}
static int cbs_h2645_fragment_add_nals(CodedBitstreamContext *ctx,
CodedBitstreamFragment *frag,
const H2645Packet *packet)
{
int err, i;
for (i = 0; i < packet->nb_nals; i++) {
const H2645NAL *nal = &packet->nals[i];
size_t size = nal->size;
uint8_t *data;
// Remove trailing zeroes.
while (size > 0 && nal->data[size - 1] == 0)
--size;
av_assert0(size > 0);
data = av_malloc(size + AV_INPUT_BUFFER_PADDING_SIZE);
if (!data)
return AVERROR(ENOMEM);
memcpy(data, nal->data, size);
memset(data + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
err = ff_cbs_insert_unit_data(ctx, frag, -1, nal->type,
data, size, NULL);
if (err < 0) {
av_freep(&data);
return err;
}
}
return 0;
}
static int cbs_h2645_split_fragment(CodedBitstreamContext *ctx,
CodedBitstreamFragment *frag,
int header)
{
enum AVCodecID codec_id = ctx->codec->codec_id;
CodedBitstreamH2645Context *priv = ctx->priv_data;
GetByteContext gbc;
int err;
av_assert0(frag->data && frag->nb_units == 0);
if (frag->data_size == 0)
return 0;
if (header && frag->data[0] && codec_id == AV_CODEC_ID_H264) {
// AVCC header.
size_t size, start, end;
int i, count, version;
priv->mp4 = 1;
bytestream2_init(&gbc, frag->data, frag->data_size);
if (bytestream2_get_bytes_left(&gbc) < 6)
return AVERROR_INVALIDDATA;
version = bytestream2_get_byte(&gbc);
if (version != 1) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid AVCC header: "
"first byte %u.", version);
return AVERROR_INVALIDDATA;
}
bytestream2_skip(&gbc, 3);
priv->nal_length_size = (bytestream2_get_byte(&gbc) & 3) + 1;
// SPS array.
count = bytestream2_get_byte(&gbc) & 0x1f;
start = bytestream2_tell(&gbc);
for (i = 0; i < count; i++) {
if (bytestream2_get_bytes_left(&gbc) < 2 * (count - i))
return AVERROR_INVALIDDATA;
size = bytestream2_get_be16(&gbc);
if (bytestream2_get_bytes_left(&gbc) < size)
return AVERROR_INVALIDDATA;
bytestream2_skip(&gbc, size);
}
end = bytestream2_tell(&gbc);
err = ff_h2645_packet_split(&priv->read_packet,
frag->data + start, end - start,
ctx->log_ctx, 1, 2, AV_CODEC_ID_H264, 1);
if (err < 0) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Failed to split AVCC SPS array.\n");
return err;
}
err = cbs_h2645_fragment_add_nals(ctx, frag, &priv->read_packet);
if (err < 0)
return err;
// PPS array.
count = bytestream2_get_byte(&gbc);
start = bytestream2_tell(&gbc);
for (i = 0; i < count; i++) {
if (bytestream2_get_bytes_left(&gbc) < 2 * (count - i))
return AVERROR_INVALIDDATA;
size = bytestream2_get_be16(&gbc);
if (bytestream2_get_bytes_left(&gbc) < size)
return AVERROR_INVALIDDATA;
bytestream2_skip(&gbc, size);
}
end = bytestream2_tell(&gbc);
err = ff_h2645_packet_split(&priv->read_packet,
frag->data + start, end - start,
ctx->log_ctx, 1, 2, AV_CODEC_ID_H264, 1);
if (err < 0) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Failed to split AVCC PPS array.\n");
return err;
}
err = cbs_h2645_fragment_add_nals(ctx, frag, &priv->read_packet);
if (err < 0)
return err;
if (bytestream2_get_bytes_left(&gbc) > 0) {
av_log(ctx->log_ctx, AV_LOG_WARNING, "%u bytes left at end of AVCC "
"header.\n", bytestream2_get_bytes_left(&gbc));
}
} else if (header && frag->data[0] && codec_id == AV_CODEC_ID_HEVC) {
// HVCC header.
size_t size, start, end;
int i, j, nb_arrays, nal_unit_type, nb_nals, version;
priv->mp4 = 1;
bytestream2_init(&gbc, frag->data, frag->data_size);
if (bytestream2_get_bytes_left(&gbc) < 23)
return AVERROR_INVALIDDATA;
version = bytestream2_get_byte(&gbc);
if (version != 1) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid HVCC header: "
"first byte %u.", version);
return AVERROR_INVALIDDATA;
}
bytestream2_skip(&gbc, 20);
priv->nal_length_size = (bytestream2_get_byte(&gbc) & 3) + 1;
nb_arrays = bytestream2_get_byte(&gbc);
for (i = 0; i < nb_arrays; i++) {
nal_unit_type = bytestream2_get_byte(&gbc) & 0x3f;
nb_nals = bytestream2_get_be16(&gbc);
start = bytestream2_tell(&gbc);
for (j = 0; j < nb_nals; j++) {
if (bytestream2_get_bytes_left(&gbc) < 2)
return AVERROR_INVALIDDATA;
size = bytestream2_get_be16(&gbc);
if (bytestream2_get_bytes_left(&gbc) < size)
return AVERROR_INVALIDDATA;
bytestream2_skip(&gbc, size);
}
end = bytestream2_tell(&gbc);
err = ff_h2645_packet_split(&priv->read_packet,
frag->data + start, end - start,
ctx->log_ctx, 1, 2, AV_CODEC_ID_HEVC, 1);
if (err < 0) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Failed to split "
"HVCC array %d (%d NAL units of type %d).\n",
i, nb_nals, nal_unit_type);
return err;
}
err = cbs_h2645_fragment_add_nals(ctx, frag, &priv->read_packet);
if (err < 0)
return err;
}
} else {
// Annex B, or later MP4 with already-known parameters.
err = ff_h2645_packet_split(&priv->read_packet,
frag->data, frag->data_size,
ctx->log_ctx,
priv->mp4, priv->nal_length_size,
codec_id, 1);
if (err < 0)
return err;
err = cbs_h2645_fragment_add_nals(ctx, frag, &priv->read_packet);
if (err < 0)
return err;
}
return 0;
}
#define cbs_h2645_replace_ps(h26n, ps_name, ps_var, id_element) \
static int cbs_h26 ## h26n ## _replace_ ## ps_var(CodedBitstreamContext *ctx, \
CodedBitstreamUnit *unit) \
{ \
CodedBitstreamH26 ## h26n ## Context *priv = ctx->priv_data; \
H26 ## h26n ## Raw ## ps_name *ps_var = unit->content; \
unsigned int id = ps_var->id_element; \
if (id > FF_ARRAY_ELEMS(priv->ps_var)) { \
av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid " #ps_name \
" id : %d.\n", id); \
return AVERROR_INVALIDDATA; \
} \
if (priv->ps_var[id] == priv->active_ ## ps_var) \
priv->active_ ## ps_var = NULL ; \
av_buffer_unref(&priv->ps_var ## _ref[id]); \
if (unit->content_ref) \
priv->ps_var ## _ref[id] = av_buffer_ref(unit->content_ref); \
else \
priv->ps_var ## _ref[id] = av_buffer_alloc(sizeof(*ps_var)); \
if (!priv->ps_var ## _ref[id]) \
return AVERROR(ENOMEM); \
priv->ps_var[id] = (H26 ## h26n ## Raw ## ps_name *)priv->ps_var ## _ref[id]->data; \
if (!unit->content_ref) \
memcpy(priv->ps_var[id], ps_var, sizeof(*ps_var)); \
return 0; \
}
cbs_h2645_replace_ps(4, SPS, sps, seq_parameter_set_id)
cbs_h2645_replace_ps(4, PPS, pps, pic_parameter_set_id)
cbs_h2645_replace_ps(5, VPS, vps, vps_video_parameter_set_id)
cbs_h2645_replace_ps(5, SPS, sps, sps_seq_parameter_set_id)
cbs_h2645_replace_ps(5, PPS, pps, pps_pic_parameter_set_id)
static int cbs_h264_read_nal_unit(CodedBitstreamContext *ctx,
CodedBitstreamUnit *unit)
{
GetBitContext gbc;
int err;
err = init_get_bits(&gbc, unit->data, 8 * unit->data_size);
if (err < 0)
return err;
switch (unit->type) {
case H264_NAL_SPS:
{
H264RawSPS *sps;
err = ff_cbs_alloc_unit_content(ctx, unit, sizeof(*sps), NULL);
if (err < 0)
return err;
sps = unit->content;
err = cbs_h264_read_sps(ctx, &gbc, sps);
if (err < 0)
return err;
err = cbs_h264_replace_sps(ctx, unit);
if (err < 0)
return err;
}
break;
case H264_NAL_SPS_EXT:
{
err = ff_cbs_alloc_unit_content(ctx, unit,
sizeof(H264RawSPSExtension),
NULL);
if (err < 0)
return err;
err = cbs_h264_read_sps_extension(ctx, &gbc, unit->content);
if (err < 0)
return err;
}
break;
case H264_NAL_PPS:
{
H264RawPPS *pps;
err = ff_cbs_alloc_unit_content(ctx, unit, sizeof(*pps),
&cbs_h264_free_pps);
if (err < 0)
return err;
pps = unit->content;
err = cbs_h264_read_pps(ctx, &gbc, pps);
if (err < 0)
return err;
err = cbs_h264_replace_pps(ctx, unit);
if (err < 0)
return err;
}
break;
case H264_NAL_SLICE:
case H264_NAL_IDR_SLICE:
case H264_NAL_AUXILIARY_SLICE:
{
H264RawSlice *slice;
int pos, len;
err = ff_cbs_alloc_unit_content(ctx, unit, sizeof(*slice),
&cbs_h264_free_slice);
if (err < 0)
return err;
slice = unit->content;
err = cbs_h264_read_slice_header(ctx, &gbc, &slice->header);
if (err < 0)
return err;
pos = get_bits_count(&gbc);
len = unit->data_size;
if (!unit->data[len - 1]) {
int z;
for (z = 0; z < len && !unit->data[len - z - 1]; z++);
av_log(ctx->log_ctx, AV_LOG_DEBUG, "Deleted %d trailing zeroes "
"from slice data.\n", z);
len -= z;
}
slice->data_size = len - pos / 8;
slice->data_ref = av_buffer_ref(unit->data_ref);
if (!slice->data_ref)
return AVERROR(ENOMEM);
slice->data = unit->data + pos / 8;
slice->data_bit_start = pos % 8;
}
break;
case H264_NAL_AUD:
{
err = ff_cbs_alloc_unit_content(ctx, unit,
sizeof(H264RawAUD), NULL);
if (err < 0)
return err;
err = cbs_h264_read_aud(ctx, &gbc, unit->content);
if (err < 0)
return err;
}
break;
case H264_NAL_SEI:
{
err = ff_cbs_alloc_unit_content(ctx, unit, sizeof(H264RawSEI),
&cbs_h264_free_sei);
if (err < 0)
return err;
err = cbs_h264_read_sei(ctx, &gbc, unit->content);
if (err < 0)
return err;
}
break;
case H264_NAL_FILLER_DATA:
{
err = ff_cbs_alloc_unit_content(ctx, unit,
sizeof(H264RawFiller), NULL);
if (err < 0)
return err;
err = cbs_h264_read_filler(ctx, &gbc, unit->content);
if (err < 0)
return err;
}
break;
case H264_NAL_END_SEQUENCE:
case H264_NAL_END_STREAM:
{
err = ff_cbs_alloc_unit_content(ctx, unit,
sizeof(H264RawNALUnitHeader),
NULL);
if (err < 0)
return err;
err = (unit->type == H264_NAL_END_SEQUENCE ?
cbs_h264_read_end_of_sequence :
cbs_h264_read_end_of_stream)(ctx, &gbc, unit->content);
if (err < 0)
return err;
}
break;
default:
return AVERROR(ENOSYS);
}
return 0;
}
static int cbs_h265_read_nal_unit(CodedBitstreamContext *ctx,
CodedBitstreamUnit *unit)
{
GetBitContext gbc;
int err;
err = init_get_bits(&gbc, unit->data, 8 * unit->data_size);
if (err < 0)
return err;
switch (unit->type) {
case HEVC_NAL_VPS:
{
H265RawVPS *vps;
err = ff_cbs_alloc_unit_content(ctx, unit, sizeof(*vps),
&cbs_h265_free_vps);
if (err < 0)
return err;
vps = unit->content;
err = cbs_h265_read_vps(ctx, &gbc, vps);
if (err < 0)
return err;
err = cbs_h265_replace_vps(ctx, unit);
if (err < 0)
return err;
}
break;
case HEVC_NAL_SPS:
{
H265RawSPS *sps;
err = ff_cbs_alloc_unit_content(ctx, unit, sizeof(*sps),
&cbs_h265_free_sps);
if (err < 0)
return err;
sps = unit->content;
err = cbs_h265_read_sps(ctx, &gbc, sps);
if (err < 0)
return err;
err = cbs_h265_replace_sps(ctx, unit);
if (err < 0)
return err;
}
break;
case HEVC_NAL_PPS:
{
H265RawPPS *pps;
err = ff_cbs_alloc_unit_content(ctx, unit, sizeof(*pps),
&cbs_h265_free_pps);
if (err < 0)
return err;
pps = unit->content;
err = cbs_h265_read_pps(ctx, &gbc, pps);
if (err < 0)
return err;
err = cbs_h265_replace_pps(ctx, unit);
if (err < 0)
return err;
}
break;
case HEVC_NAL_TRAIL_N:
case HEVC_NAL_TRAIL_R:
case HEVC_NAL_TSA_N:
case HEVC_NAL_TSA_R:
case HEVC_NAL_STSA_N:
case HEVC_NAL_STSA_R:
case HEVC_NAL_RADL_N:
case HEVC_NAL_RADL_R:
case HEVC_NAL_RASL_N:
case HEVC_NAL_RASL_R:
case HEVC_NAL_BLA_W_LP:
case HEVC_NAL_BLA_W_RADL:
case HEVC_NAL_BLA_N_LP:
case HEVC_NAL_IDR_W_RADL:
case HEVC_NAL_IDR_N_LP:
case HEVC_NAL_CRA_NUT:
{
H265RawSlice *slice;
int pos, len;
err = ff_cbs_alloc_unit_content(ctx, unit, sizeof(*slice),
&cbs_h265_free_slice);
if (err < 0)
return err;
slice = unit->content;
err = cbs_h265_read_slice_segment_header(ctx, &gbc, &slice->header);
if (err < 0)
return err;
pos = get_bits_count(&gbc);
len = unit->data_size;
if (!unit->data[len - 1]) {
int z;
for (z = 0; z < len && !unit->data[len - z - 1]; z++);
av_log(ctx->log_ctx, AV_LOG_DEBUG, "Deleted %d trailing zeroes "
"from slice data.\n", z);
len -= z;
}
slice->data_size = len - pos / 8;
slice->data_ref = av_buffer_ref(unit->data_ref);
if (!slice->data_ref)
return AVERROR(ENOMEM);
slice->data = unit->data + pos / 8;
slice->data_bit_start = pos % 8;
}
break;
case HEVC_NAL_AUD:
{
err = ff_cbs_alloc_unit_content(ctx, unit,
sizeof(H265RawAUD), NULL);
if (err < 0)
return err;
err = cbs_h265_read_aud(ctx, &gbc, unit->content);
if (err < 0)
return err;
}
break;
case HEVC_NAL_SEI_PREFIX:
case HEVC_NAL_SEI_SUFFIX:
{
err = ff_cbs_alloc_unit_content(ctx, unit, sizeof(H265RawSEI),
&cbs_h265_free_sei);
if (err < 0)
return err;
err = cbs_h265_read_sei(ctx, &gbc, unit->content,
unit->type == HEVC_NAL_SEI_PREFIX);
if (err < 0)
return err;
}
break;
default:
return AVERROR(ENOSYS);
}
return 0;
}
static int cbs_h2645_write_slice_data(CodedBitstreamContext *ctx,
PutBitContext *pbc, const uint8_t *data,
size_t data_size, int data_bit_start)
{
size_t rest = data_size - (data_bit_start + 7) / 8;
const uint8_t *pos = data + data_bit_start / 8;
av_assert0(data_bit_start >= 0 &&
8 * data_size > data_bit_start);
if (data_size * 8 + 8 > put_bits_left(pbc))
return AVERROR(ENOSPC);
if (!rest)
goto rbsp_stop_one_bit;
// First copy the remaining bits of the first byte
// The above check ensures that we do not accidentally
// copy beyond the rbsp_stop_one_bit.
if (data_bit_start % 8)
put_bits(pbc, 8 - data_bit_start % 8,
*pos++ & MAX_UINT_BITS(8 - data_bit_start % 8));
if (put_bits_count(pbc) % 8 == 0) {
// If the writer is aligned at this point,
// memcpy can be used to improve performance.
// This happens normally for CABAC.
flush_put_bits(pbc);
memcpy(put_bits_ptr(pbc), pos, rest);
skip_put_bytes(pbc, rest);
} else {
// If not, we have to copy manually.
// rbsp_stop_one_bit forces us to special-case
// the last byte.
uint8_t temp;
int i;
for (; rest > 4; rest -= 4, pos += 4)
put_bits32(pbc, AV_RB32(pos));
for (; rest > 1; rest--, pos++)
put_bits(pbc, 8, *pos);
rbsp_stop_one_bit:
temp = rest ? *pos : *pos & MAX_UINT_BITS(8 - data_bit_start % 8);
av_assert0(temp);
i = ff_ctz(*pos);
temp = temp >> i;
i = rest ? (8 - i) : (8 - i - data_bit_start % 8);
put_bits(pbc, i, temp);
if (put_bits_count(pbc) % 8)
put_bits(pbc, 8 - put_bits_count(pbc) % 8, 0);
}
return 0;
}
static int cbs_h264_write_nal_unit(CodedBitstreamContext *ctx,
CodedBitstreamUnit *unit,
PutBitContext *pbc)
{
int err;
switch (unit->type) {
case H264_NAL_SPS:
{
H264RawSPS *sps = unit->content;
err = cbs_h264_write_sps(ctx, pbc, sps);
if (err < 0)
return err;
err = cbs_h264_replace_sps(ctx, unit);
if (err < 0)
return err;
}
break;
case H264_NAL_SPS_EXT:
{
H264RawSPSExtension *sps_ext = unit->content;
err = cbs_h264_write_sps_extension(ctx, pbc, sps_ext);
if (err < 0)
return err;
}
break;
case H264_NAL_PPS:
{
H264RawPPS *pps = unit->content;
err = cbs_h264_write_pps(ctx, pbc, pps);
if (err < 0)
return err;
err = cbs_h264_replace_pps(ctx, unit);
if (err < 0)
return err;
}
break;
case H264_NAL_SLICE:
case H264_NAL_IDR_SLICE:
case H264_NAL_AUXILIARY_SLICE:
{
H264RawSlice *slice = unit->content;
err = cbs_h264_write_slice_header(ctx, pbc, &slice->header);
if (err < 0)
return err;
if (slice->data) {
err = cbs_h2645_write_slice_data(ctx, pbc, slice->data,
slice->data_size,
slice->data_bit_start);
if (err < 0)
return err;
} else {
// No slice data - that was just the header.
// (Bitstream may be unaligned!)
}
}
break;
case H264_NAL_AUD:
{
err = cbs_h264_write_aud(ctx, pbc, unit->content);
if (err < 0)
return err;
}
break;
case H264_NAL_SEI:
{
err = cbs_h264_write_sei(ctx, pbc, unit->content);
if (err < 0)
return err;
}
break;
case H264_NAL_FILLER_DATA:
{
err = cbs_h264_write_filler(ctx, pbc, unit->content);
if (err < 0)
return err;
}
break;
case H264_NAL_END_SEQUENCE:
{
err = cbs_h264_write_end_of_sequence(ctx, pbc, unit->content);
if (err < 0)
return err;
}
break;
case H264_NAL_END_STREAM:
{
err = cbs_h264_write_end_of_stream(ctx, pbc, unit->content);
if (err < 0)
return err;
}
break;
default:
av_log(ctx->log_ctx, AV_LOG_ERROR, "Write unimplemented for "
"NAL unit type %"PRIu32".\n", unit->type);
return AVERROR_PATCHWELCOME;
}
return 0;
}
static int cbs_h265_write_nal_unit(CodedBitstreamContext *ctx,
CodedBitstreamUnit *unit,
PutBitContext *pbc)
{
int err;
switch (unit->type) {
case HEVC_NAL_VPS:
{
H265RawVPS *vps = unit->content;
err = cbs_h265_write_vps(ctx, pbc, vps);
if (err < 0)
return err;
err = cbs_h265_replace_vps(ctx, unit);
if (err < 0)
return err;
}
break;
case HEVC_NAL_SPS:
{
H265RawSPS *sps = unit->content;
err = cbs_h265_write_sps(ctx, pbc, sps);
if (err < 0)
return err;
err = cbs_h265_replace_sps(ctx, unit);
if (err < 0)
return err;
}
break;
case HEVC_NAL_PPS:
{
H265RawPPS *pps = unit->content;
err = cbs_h265_write_pps(ctx, pbc, pps);
if (err < 0)
return err;
err = cbs_h265_replace_pps(ctx, unit);
if (err < 0)
return err;
}
break;
case HEVC_NAL_TRAIL_N:
case HEVC_NAL_TRAIL_R:
case HEVC_NAL_TSA_N:
case HEVC_NAL_TSA_R:
case HEVC_NAL_STSA_N:
case HEVC_NAL_STSA_R:
case HEVC_NAL_RADL_N:
case HEVC_NAL_RADL_R:
case HEVC_NAL_RASL_N:
case HEVC_NAL_RASL_R:
case HEVC_NAL_BLA_W_LP:
case HEVC_NAL_BLA_W_RADL:
case HEVC_NAL_BLA_N_LP:
case HEVC_NAL_IDR_W_RADL:
case HEVC_NAL_IDR_N_LP:
case HEVC_NAL_CRA_NUT:
{
H265RawSlice *slice = unit->content;
err = cbs_h265_write_slice_segment_header(ctx, pbc, &slice->header);
if (err < 0)
return err;
if (slice->data) {
err = cbs_h2645_write_slice_data(ctx, pbc, slice->data,
slice->data_size,
slice->data_bit_start);
if (err < 0)
return err;
} else {
// No slice data - that was just the header.
}
}
break;
case HEVC_NAL_AUD:
{
err = cbs_h265_write_aud(ctx, pbc, unit->content);
if (err < 0)
return err;
}
break;
case HEVC_NAL_SEI_PREFIX:
case HEVC_NAL_SEI_SUFFIX:
{
err = cbs_h265_write_sei(ctx, pbc, unit->content,
unit->type == HEVC_NAL_SEI_PREFIX);
if (err < 0)
return err;
}
break;
default:
av_log(ctx->log_ctx, AV_LOG_ERROR, "Write unimplemented for "
"NAL unit type %"PRIu32".\n", unit->type);
return AVERROR_PATCHWELCOME;
}
return 0;
}
static int cbs_h2645_write_nal_unit(CodedBitstreamContext *ctx,
CodedBitstreamUnit *unit)
{
CodedBitstreamH2645Context *priv = ctx->priv_data;
enum AVCodecID codec_id = ctx->codec->codec_id;
PutBitContext pbc;
int err;
if (!priv->write_buffer) {
// Initial write buffer size is 1MB.
priv->write_buffer_size = 1024 * 1024;
reallocate_and_try_again:
err = av_reallocp(&priv->write_buffer, priv->write_buffer_size);
if (err < 0) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Unable to allocate a "
"sufficiently large write buffer (last attempt "
"%"SIZE_SPECIFIER" bytes).\n", priv->write_buffer_size);
return err;
}
}
init_put_bits(&pbc, priv->write_buffer, priv->write_buffer_size);
if (codec_id == AV_CODEC_ID_H264)
err = cbs_h264_write_nal_unit(ctx, unit, &pbc);
else
err = cbs_h265_write_nal_unit(ctx, unit, &pbc);
if (err == AVERROR(ENOSPC)) {
// Overflow.
priv->write_buffer_size *= 2;
goto reallocate_and_try_again;
}
// Overflow but we didn't notice.
av_assert0(put_bits_count(&pbc) <= 8 * priv->write_buffer_size);
if (err < 0) {
// Write failed for some other reason.
return err;
}
if (put_bits_count(&pbc) % 8)
unit->data_bit_padding = 8 - put_bits_count(&pbc) % 8;
else
unit->data_bit_padding = 0;
unit->data_size = (put_bits_count(&pbc) + 7) / 8;
flush_put_bits(&pbc);
err = ff_cbs_alloc_unit_data(ctx, unit, unit->data_size);
if (err < 0)
return err;
memcpy(unit->data, priv->write_buffer, unit->data_size);
return 0;
}
static int cbs_h2645_assemble_fragment(CodedBitstreamContext *ctx,
CodedBitstreamFragment *frag)
{
uint8_t *data;
size_t max_size, dp, sp;
int err, i, zero_run;
for (i = 0; i < frag->nb_units; i++) {
// Data should already all have been written when we get here.
av_assert0(frag->units[i].data);
}
max_size = 0;
for (i = 0; i < frag->nb_units; i++) {
// Start code + content with worst-case emulation prevention.
max_size += 3 + frag->units[i].data_size * 3 / 2;
}
data = av_malloc(max_size + AV_INPUT_BUFFER_PADDING_SIZE);
if (!data)
return AVERROR(ENOMEM);
dp = 0;
for (i = 0; i < frag->nb_units; i++) {
CodedBitstreamUnit *unit = &frag->units[i];
if (unit->data_bit_padding > 0) {
if (i < frag->nb_units - 1)
av_log(ctx->log_ctx, AV_LOG_WARNING, "Probably invalid "
"unaligned padding on non-final NAL unit.\n");
else
frag->data_bit_padding = unit->data_bit_padding;
}
if ((ctx->codec->codec_id == AV_CODEC_ID_H264 &&
(unit->type == H264_NAL_SPS ||
unit->type == H264_NAL_PPS)) ||
(ctx->codec->codec_id == AV_CODEC_ID_HEVC &&
(unit->type == HEVC_NAL_VPS ||
unit->type == HEVC_NAL_SPS ||
unit->type == HEVC_NAL_PPS)) ||
i == 0 /* (Assume this is the start of an access unit.) */) {
// zero_byte
data[dp++] = 0;
}
// start_code_prefix_one_3bytes
data[dp++] = 0;
data[dp++] = 0;
data[dp++] = 1;
zero_run = 0;
for (sp = 0; sp < unit->data_size; sp++) {
if (zero_run < 2) {
if (unit->data[sp] == 0)
++zero_run;
else
zero_run = 0;
} else {
if ((unit->data[sp] & ~3) == 0) {
// emulation_prevention_three_byte
data[dp++] = 3;
}
zero_run = unit->data[sp] == 0;
}
data[dp++] = unit->data[sp];
}
}
av_assert0(dp <= max_size);
err = av_reallocp(&data, dp + AV_INPUT_BUFFER_PADDING_SIZE);
if (err)
return err;
memset(data + dp, 0, AV_INPUT_BUFFER_PADDING_SIZE);
frag->data_ref = av_buffer_create(data, dp + AV_INPUT_BUFFER_PADDING_SIZE,
NULL, NULL, 0);
if (!frag->data_ref) {
av_freep(&data);
return AVERROR(ENOMEM);
}
frag->data = data;
frag->data_size = dp;
return 0;
}
static void cbs_h264_close(CodedBitstreamContext *ctx)
{
CodedBitstreamH264Context *h264 = ctx->priv_data;
int i;
ff_h2645_packet_uninit(&h264->common.read_packet);
av_freep(&h264->common.write_buffer);
for (i = 0; i < FF_ARRAY_ELEMS(h264->sps); i++)
av_buffer_unref(&h264->sps_ref[i]);
for (i = 0; i < FF_ARRAY_ELEMS(h264->pps); i++)
av_buffer_unref(&h264->pps_ref[i]);
}
static void cbs_h265_close(CodedBitstreamContext *ctx)
{
CodedBitstreamH265Context *h265 = ctx->priv_data;
int i;
ff_h2645_packet_uninit(&h265->common.read_packet);
av_freep(&h265->common.write_buffer);
for (i = 0; i < FF_ARRAY_ELEMS(h265->vps); i++)
av_buffer_unref(&h265->vps_ref[i]);
for (i = 0; i < FF_ARRAY_ELEMS(h265->sps); i++)
av_buffer_unref(&h265->sps_ref[i]);
for (i = 0; i < FF_ARRAY_ELEMS(h265->pps); i++)
av_buffer_unref(&h265->pps_ref[i]);
}
const CodedBitstreamType ff_cbs_type_h264 = {
.codec_id = AV_CODEC_ID_H264,
.priv_data_size = sizeof(CodedBitstreamH264Context),
.split_fragment = &cbs_h2645_split_fragment,
.read_unit = &cbs_h264_read_nal_unit,
.write_unit = &cbs_h2645_write_nal_unit,
.assemble_fragment = &cbs_h2645_assemble_fragment,
.close = &cbs_h264_close,
};
const CodedBitstreamType ff_cbs_type_h265 = {
.codec_id = AV_CODEC_ID_HEVC,
.priv_data_size = sizeof(CodedBitstreamH265Context),
.split_fragment = &cbs_h2645_split_fragment,
.read_unit = &cbs_h265_read_nal_unit,
.write_unit = &cbs_h2645_write_nal_unit,
.assemble_fragment = &cbs_h2645_assemble_fragment,
.close = &cbs_h265_close,
};
int ff_cbs_h264_add_sei_message(CodedBitstreamContext *ctx,
CodedBitstreamFragment *au,
const H264RawSEIPayload *payload)
{
H264RawSEI *sei;
CodedBitstreamUnit *nal = NULL;
int err, i;
// Find an existing SEI NAL unit to add to.
for (i = 0; i < au->nb_units; i++) {
if (au->units[i].type == H264_NAL_SEI) {
nal = &au->units[i];
break;
}
}
if (nal) {
sei = nal->content;
} else {
// Need to make a new SEI NAL unit. Insert it before the first
// slice data NAL unit; if no slice data, add at the end.
AVBufferRef *sei_ref;
sei = av_mallocz(sizeof(*sei));
if (!sei)
return AVERROR(ENOMEM);
sei->nal_unit_header.nal_unit_type = H264_NAL_SEI;
sei->nal_unit_header.nal_ref_idc = 0;
sei_ref = av_buffer_create((uint8_t*)sei, sizeof(*sei),
&cbs_h264_free_sei, ctx, 0);
if (!sei_ref) {
av_freep(&sei);
return AVERROR(ENOMEM);
}
for (i = 0; i < au->nb_units; i++) {
if (au->units[i].type == H264_NAL_SLICE ||
au->units[i].type == H264_NAL_IDR_SLICE)
break;
}
err = ff_cbs_insert_unit_content(ctx, au, i, H264_NAL_SEI,
sei, sei_ref);
av_buffer_unref(&sei_ref);
if (err < 0)
return err;
}
if (sei->payload_count >= H264_MAX_SEI_PAYLOADS) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Too many payloads in "
"SEI NAL unit.\n");
return AVERROR(EINVAL);
}
memcpy(&sei->payload[sei->payload_count], payload, sizeof(*payload));
++sei->payload_count;
return 0;
}
int ff_cbs_h264_delete_sei_message(CodedBitstreamContext *ctx,
CodedBitstreamFragment *au,
CodedBitstreamUnit *nal,
int position)
{
H264RawSEI *sei = nal->content;
av_assert0(nal->type == H264_NAL_SEI);
av_assert0(position >= 0 && position < sei->payload_count);
if (position == 0 && sei->payload_count == 1) {
// Deleting NAL unit entirely.
int i;
for (i = 0; i < au->nb_units; i++) {
if (&au->units[i] == nal)
break;
}
av_assert0(i < au->nb_units && "NAL unit not in access unit.");
return ff_cbs_delete_unit(ctx, au, i);
} else {
cbs_h264_free_sei_payload(&sei->payload[position]);
--sei->payload_count;
memmove(sei->payload + position,
sei->payload + position + 1,
(sei->payload_count - position) * sizeof(*sei->payload));
return 0;
}
}
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