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FFmpeg/libavcodec/cbs_h2645.c
Mark Thompson 7bf3f38046 cbs: Add padding to slice data allocations 
These may be read by the bitstream reader, so they should include the
necessary padding for overreads.
2017-12-02 15:21:30 +00:00

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/*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; 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"
static int cbs_read_ue_golomb(CodedBitstreamContext *ctx, BitstreamContext *bc,
const char *name, 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 = bitstream_tell(bc);
for (i = 0; i < 32; i++) {
if (bitstream_bits_left(bc) < i + 1) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid ue-golomb code at "
"%s: bitstream ended.\n", name);
return AVERROR_INVALIDDATA;
}
k = bitstream_read_bit(bc);
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 = bitstream_read_bit(bc);
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, 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, BitstreamContext *bc,
const char *name, 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 = bitstream_tell(bc);
for (i = 0; i < 32; i++) {
if (bitstream_bits_left(bc) < i + 1) {
av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid se-golomb code at "
"%s: bitstream ended.\n", name);
return AVERROR_INVALIDDATA;
}
k = bitstream_read_bit(bc);
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 = bitstream_read_bit(bc);
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, 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, 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, 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, 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, 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 READ
#define READWRITE read
#define RWContext BitstreamContext
#define xu(width, name, var, range_min, range_max) do { \
uint32_t value = range_min; \
CHECK(ff_cbs_read_unsigned(ctx, rw, width, #name, \
&value, range_min, range_max)); \
var = value; \
} while (0)
#define xue(name, var, range_min, range_max) do { \
uint32_t value = range_min; \
CHECK(cbs_read_ue_golomb(ctx, rw, #name, \
&value, range_min, range_max)); \
var = value; \
} while (0)
#define xse(name, var, range_min, range_max) do { \
int32_t value = range_min; \
CHECK(cbs_read_se_golomb(ctx, rw, #name, \
&value, range_min, range_max)); \
var = value; \
} while (0)
#define u(width, name, range_min, range_max) \
xu(width, name, current->name, range_min, range_max)
#define flag(name) u(1, name, 0, 1)
#define ue(name, range_min, range_max) \
xue(name, current->name, range_min, range_max)
#define se(name, range_min, range_max) \
xse(name, current->name, range_min, range_max)
#define infer(name, value) do { \
current->name = value; \
} while (0)
static int cbs_h2645_read_more_rbsp_data(BitstreamContext *bc)
{
int bits_left = bitstream_bits_left(bc);
if (bits_left > 8)
return 1;
if (bitstream_peek(bc, 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) (bitstream_tell(rw) % 8)
#define allocate(name, size) do { \
name = av_mallocz(size); \
if (!name) \
return AVERROR(ENOMEM); \
} 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 u
#undef flag
#undef ue
#undef se
#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) do { \
uint32_t value = var; \
CHECK(ff_cbs_write_unsigned(ctx, rw, width, #name, \
value, range_min, range_max)); \
} while (0)
#define xue(name, var, range_min, range_max) do { \
uint32_t value = var; \
CHECK(cbs_write_ue_golomb(ctx, rw, #name, \
value, range_min, range_max)); \
} while (0)
#define xse(name, var, range_min, range_max) do { \
int32_t value = var; \
CHECK(cbs_write_se_golomb(ctx, rw, #name, \
value, range_min, range_max)); \
} while (0)
#define u(width, name, range_min, range_max) \
xu(width, name, current->name, range_min, range_max)
#define flag(name) u(1, name, 0, 1)
#define ue(name, range_min, range_max) \
xue(name, current->name, range_min, range_max)
#define se(name, range_min, range_max) \
xse(name, current->name, range_min, range_max)
#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_sei(H264RawSEI *sei)
{
int i;
for (i = 0; i < sei->payload_count; i++) {
H264RawSEIPayload *payload = &sei->payload[i];
switch (payload->payload_type) {
case H264_SEI_TYPE_BUFFERING_PERIOD:
case H264_SEI_TYPE_PIC_TIMING:
case H264_SEI_TYPE_RECOVERY_POINT:
case H264_SEI_TYPE_DISPLAY_ORIENTATION:
break;
case H264_SEI_TYPE_USER_DATA_REGISTERED:
av_freep(&payload->payload.user_data_registered.data);
break;
case H264_SEI_TYPE_USER_DATA_UNREGISTERED:
av_freep(&payload->payload.user_data_unregistered.data);
break;
default:
av_freep(&payload->payload.other.data);
break;
}
}
}
static void cbs_h264_free_slice(H264RawSlice *slice)
{
av_freep(&slice->data);
}
static void cbs_h264_free_nal_unit(CodedBitstreamUnit *unit)
{
switch (unit->type) {
case H264_NAL_SEI:
cbs_h264_free_sei(unit->content);
break;
case H264_NAL_IDR_SLICE:
case H264_NAL_SLICE:
cbs_h264_free_slice(unit->content);
break;
}
av_freep(&unit->content);
}
static void cbs_h265_free_nal_unit(CodedBitstreamUnit *unit)
{
switch (unit->type) {
case HEVC_NAL_VPS:
av_freep(&((H265RawVPS*)unit->content)->extension_data.data);
break;
case HEVC_NAL_SPS:
av_freep(&((H265RawSPS*)unit->content)->extension_data.data);
break;
case HEVC_NAL_PPS:
av_freep(&((H265RawPPS*)unit->content)->extension_data.data);
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:
av_freep(&((H265RawSlice*)unit->content)->data);
break;
}
av_freep(&unit->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, nal->size);
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);
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);
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);
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);
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, \
const H26 ## h26n ## Raw ## ps_name *ps_var) \
{ \
CodedBitstreamH26 ## h26n ## Context *priv = ctx->priv_data; \
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; \
} \
av_freep(&priv->ps_var[id]); \
priv->ps_var[id] = av_malloc(sizeof(*ps_var)); \
if (!priv->ps_var[id]) \
return AVERROR(ENOMEM); \
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)
{
BitstreamContext bc;
int err;
err = bitstream_init(&bc, unit->data, 8 * unit->data_size);
if (err < 0)
return err;
switch (unit->type) {
case H264_NAL_SPS:
{
H264RawSPS *sps;
sps = av_mallocz(sizeof(*sps));
if (!sps)
return AVERROR(ENOMEM);
err = cbs_h264_read_sps(ctx, &bc, sps);
if (err >= 0)
err = cbs_h264_replace_sps(ctx, sps);
if (err < 0) {
av_free(sps);
return err;
}
unit->content = sps;
}
break;
case H264_NAL_SPS_EXT:
{
H264RawSPSExtension *sps_ext;
sps_ext = av_mallocz(sizeof(*sps_ext));
if (!sps_ext)
return AVERROR(ENOMEM);
err = cbs_h264_read_sps_extension(ctx, &bc, sps_ext);
if (err < 0) {
av_free(sps_ext);
return err;
}
unit->content = sps_ext;
}
break;
case H264_NAL_PPS:
{
H264RawPPS *pps;
pps = av_mallocz(sizeof(*pps));
if (!pps)
return AVERROR(ENOMEM);
err = cbs_h264_read_pps(ctx, &bc, pps);
if (err >= 0)
err = cbs_h264_replace_pps(ctx, pps);
if (err < 0) {
av_free(pps);
return err;
}
unit->content = pps;
}
break;
case H264_NAL_SLICE:
case H264_NAL_IDR_SLICE:
case H264_NAL_AUXILIARY_SLICE:
{
H264RawSlice *slice;
int pos, len;
slice = av_mallocz(sizeof(*slice));
if (!slice)
return AVERROR(ENOMEM);
err = cbs_h264_read_slice_header(ctx, &bc, &slice->header);
if (err < 0) {
av_free(slice);
return err;
}
pos = bitstream_tell(&bc);
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 = av_malloc(slice->data_size +
AV_INPUT_BUFFER_PADDING_SIZE);
if (!slice->data) {
av_free(slice);
return AVERROR(ENOMEM);
}
memcpy(slice->data,
unit->data + pos / 8, slice->data_size);
memset(slice->data + slice->data_size, 0,
AV_INPUT_BUFFER_PADDING_SIZE);
slice->data_bit_start = pos % 8;
unit->content = slice;
}
break;
case H264_NAL_AUD:
{
H264RawAUD *aud;
aud = av_mallocz(sizeof(*aud));
if (!aud)
return AVERROR(ENOMEM);
err = cbs_h264_read_aud(ctx, &bc, aud);
if (err < 0) {
av_free(aud);
return err;
}
unit->content = aud;
}
break;
case H264_NAL_SEI:
{
H264RawSEI *sei;
sei = av_mallocz(sizeof(*sei));
if (!sei)
return AVERROR(ENOMEM);
err = cbs_h264_read_sei(ctx, &bc, sei);
if (err < 0) {
cbs_h264_free_sei(sei);
av_free(sei);
return err;
}
unit->content = sei;
}
break;
default:
return AVERROR(ENOSYS);
}
return 0;
}
static int cbs_h265_read_nal_unit(CodedBitstreamContext *ctx,
CodedBitstreamUnit *unit)
{
BitstreamContext bc;
int err;
err = bitstream_init(&bc, unit->data, 8 * unit->data_size);
if (err < 0)
return err;
switch (unit->type) {
case HEVC_NAL_VPS:
{
H265RawVPS *vps;
vps = av_mallocz(sizeof(*vps));
if (!vps)
return AVERROR(ENOMEM);
err = cbs_h265_read_vps(ctx, &bc, vps);
if (err >= 0)
err = cbs_h265_replace_vps(ctx, vps);
if (err < 0) {
av_free(vps);
return err;
}
unit->content = vps;
}
break;
case HEVC_NAL_SPS:
{
H265RawSPS *sps;
sps = av_mallocz(sizeof(*sps));
if (!sps)
return AVERROR(ENOMEM);
err = cbs_h265_read_sps(ctx, &bc, sps);
if (err >= 0)
err = cbs_h265_replace_sps(ctx, sps);
if (err < 0) {
av_free(sps);
return err;
}
unit->content = sps;
}
break;
case HEVC_NAL_PPS:
{
H265RawPPS *pps;
pps = av_mallocz(sizeof(*pps));
if (!pps)
return AVERROR(ENOMEM);
err = cbs_h265_read_pps(ctx, &bc, pps);
if (err >= 0)
err = cbs_h265_replace_pps(ctx, pps);
if (err < 0) {
av_free(pps);
return err;
}
unit->content = pps;
}
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;
slice = av_mallocz(sizeof(*slice));
if (!slice)
return AVERROR(ENOMEM);
err = cbs_h265_read_slice_segment_header(ctx, &bc, &slice->header);
if (err < 0) {
av_free(slice);
return err;
}
pos = bitstream_tell(&bc);
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 = av_malloc(slice->data_size +
AV_INPUT_BUFFER_PADDING_SIZE);
if (!slice->data) {
av_free(slice);
return AVERROR(ENOMEM);
}
memcpy(slice->data,
unit->data + pos / 8, slice->data_size);
memset(slice->data + slice->data_size, 0,
AV_INPUT_BUFFER_PADDING_SIZE);
slice->data_bit_start = pos % 8;
unit->content = slice;
}
break;
case HEVC_NAL_AUD:
{
H265RawAUD *aud;
aud = av_mallocz(sizeof(*aud));
if (!aud)
return AVERROR(ENOMEM);
err = cbs_h265_read_aud(ctx, &bc, aud);
if (err < 0) {
av_free(aud);
return err;
}
unit->content = aud;
}
break;
default:
return AVERROR(ENOSYS);
}
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, sps);
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, pps);
if (err < 0)
return err;
}
break;
case H264_NAL_SLICE:
case H264_NAL_IDR_SLICE:
case H264_NAL_AUXILIARY_SLICE:
{
H264RawSlice *slice = unit->content;
BitstreamContext bc;
int bits_left, end, zeroes;
err = cbs_h264_write_slice_header(ctx, pbc, &slice->header);
if (err < 0)
return err;
if (slice->data) {
if (slice->data_size * 8 + 8 > put_bits_left(pbc))
return AVERROR(ENOSPC);
bitstream_init(&bc, slice->data, slice->data_size * 8);
bitstream_skip(&bc, slice->data_bit_start);
// Copy in two-byte blocks, but stop before copying the
// rbsp_stop_one_bit in the final byte.
while (bitstream_bits_left(&bc) > 23)
put_bits(pbc, 16, bitstream_read(&bc, 16));
bits_left = bitstream_bits_left(&bc);
end = bitstream_read(&bc, bits_left);
// rbsp_stop_one_bit must be present here.
av_assert0(end);
zeroes = ff_ctz(end);
if (bits_left > zeroes + 1)
put_bits(pbc, bits_left - zeroes - 1,
end >> (zeroes + 1));
put_bits(pbc, 1, 1);
while (put_bits_count(pbc) % 8 != 0)
put_bits(pbc, 1, 0);
} 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;
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, vps);
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, sps);
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, pps);
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;
BitstreamContext bc;
int bits_left, end, zeroes;
err = cbs_h265_write_slice_segment_header(ctx, pbc, &slice->header);
if (err < 0)
return err;
if (slice->data) {
if (slice->data_size * 8 + 8 > put_bits_left(pbc))
return AVERROR(ENOSPC);
bitstream_init(&bc, slice->data, slice->data_size * 8);
bitstream_skip(&bc, slice->data_bit_start);
// Copy in two-byte blocks, but stop before copying the
// rbsp_stop_one_bit in the final byte.
while (bitstream_bits_left(&bc) > 23)
put_bits(pbc, 16, bitstream_read(&bc, 16));
bits_left = bitstream_bits_left(&bc);
end = bitstream_read(&bc, bits_left);
// rbsp_stop_one_bit must be present here.
av_assert0(end);
zeroes = ff_ctz(end);
if (bits_left > zeroes + 1)
put_bits(pbc, bits_left - zeroes - 1,
end >> (zeroes + 1));
put_bits(pbc, 1, 1);
while (put_bits_count(pbc) % 8 != 0)
put_bits(pbc, 1, 0);
} 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;
default:
av_log(ctx->log_ctx, AV_LOG_ERROR, "Write unimplemented for "
"NAL unit type %d.\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 "
"%zu 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 = av_reallocp(&unit->data, 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);
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);
if (err)
return err;
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_freep(&h264->sps[i]);
for (i = 0; i < FF_ARRAY_ELEMS(h264->pps); i++)
av_freep(&h264->pps[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_freep(&h265->vps[i]);
for (i = 0; i < FF_ARRAY_ELEMS(h265->sps); i++)
av_freep(&h265->sps[i]);
for (i = 0; i < FF_ARRAY_ELEMS(h265->pps); i++)
av_freep(&h265->pps[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,
.free_unit = &cbs_h264_free_nal_unit,
.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,
.free_unit = &cbs_h265_free_nal_unit,
.close = &cbs_h265_close,
};
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