mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
537 lines
17 KiB
537 lines
17 KiB
/* |
|
* H.264/HEVC common parsing code |
|
* |
|
* 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 <string.h> |
|
|
|
#include "config.h" |
|
|
|
#include "libavutil/intmath.h" |
|
#include "libavutil/intreadwrite.h" |
|
#include "libavutil/mem.h" |
|
|
|
#include "bytestream.h" |
|
#include "hevc.h" |
|
#include "h264.h" |
|
#include "h2645_parse.h" |
|
|
|
int ff_h2645_extract_rbsp(const uint8_t *src, int length, |
|
H2645RBSP *rbsp, H2645NAL *nal, int small_padding) |
|
{ |
|
int i, si, di; |
|
uint8_t *dst; |
|
|
|
nal->skipped_bytes = 0; |
|
#define STARTCODE_TEST \ |
|
if (i + 2 < length && src[i + 1] == 0 && src[i + 2] <= 3) { \ |
|
if (src[i + 2] != 3 && src[i + 2] != 0) { \ |
|
/* startcode, so we must be past the end */ \ |
|
length = i; \ |
|
} \ |
|
break; \ |
|
} |
|
#if HAVE_FAST_UNALIGNED |
|
#define FIND_FIRST_ZERO \ |
|
if (i > 0 && !src[i]) \ |
|
i--; \ |
|
while (src[i]) \ |
|
i++ |
|
#if HAVE_FAST_64BIT |
|
for (i = 0; i + 1 < length; i += 9) { |
|
if (!((~AV_RN64(src + i) & |
|
(AV_RN64(src + i) - 0x0100010001000101ULL)) & |
|
0x8000800080008080ULL)) |
|
continue; |
|
FIND_FIRST_ZERO; |
|
STARTCODE_TEST; |
|
i -= 7; |
|
} |
|
#else |
|
for (i = 0; i + 1 < length; i += 5) { |
|
if (!((~AV_RN32(src + i) & |
|
(AV_RN32(src + i) - 0x01000101U)) & |
|
0x80008080U)) |
|
continue; |
|
FIND_FIRST_ZERO; |
|
STARTCODE_TEST; |
|
i -= 3; |
|
} |
|
#endif /* HAVE_FAST_64BIT */ |
|
#else |
|
for (i = 0; i + 1 < length; i += 2) { |
|
if (src[i]) |
|
continue; |
|
if (i > 0 && src[i - 1] == 0) |
|
i--; |
|
STARTCODE_TEST; |
|
} |
|
#endif /* HAVE_FAST_UNALIGNED */ |
|
|
|
if (i >= length - 1 && small_padding) { // no escaped 0 |
|
nal->data = |
|
nal->raw_data = src; |
|
nal->size = |
|
nal->raw_size = length; |
|
return length; |
|
} else if (i > length) |
|
i = length; |
|
|
|
nal->rbsp_buffer = &rbsp->rbsp_buffer[rbsp->rbsp_buffer_size]; |
|
dst = nal->rbsp_buffer; |
|
|
|
memcpy(dst, src, i); |
|
si = di = i; |
|
while (si + 2 < length) { |
|
// remove escapes (very rare 1:2^22) |
|
if (src[si + 2] > 3) { |
|
dst[di++] = src[si++]; |
|
dst[di++] = src[si++]; |
|
} else if (src[si] == 0 && src[si + 1] == 0 && src[si + 2] != 0) { |
|
if (src[si + 2] == 3) { // escape |
|
dst[di++] = 0; |
|
dst[di++] = 0; |
|
si += 3; |
|
|
|
if (nal->skipped_bytes_pos) { |
|
nal->skipped_bytes++; |
|
if (nal->skipped_bytes_pos_size < nal->skipped_bytes) { |
|
nal->skipped_bytes_pos_size *= 2; |
|
av_assert0(nal->skipped_bytes_pos_size >= nal->skipped_bytes); |
|
av_reallocp_array(&nal->skipped_bytes_pos, |
|
nal->skipped_bytes_pos_size, |
|
sizeof(*nal->skipped_bytes_pos)); |
|
if (!nal->skipped_bytes_pos) { |
|
nal->skipped_bytes_pos_size = 0; |
|
return AVERROR(ENOMEM); |
|
} |
|
} |
|
if (nal->skipped_bytes_pos) |
|
nal->skipped_bytes_pos[nal->skipped_bytes-1] = di - 1; |
|
} |
|
continue; |
|
} else // next start code |
|
goto nsc; |
|
} |
|
|
|
dst[di++] = src[si++]; |
|
} |
|
while (si < length) |
|
dst[di++] = src[si++]; |
|
|
|
nsc: |
|
memset(dst + di, 0, AV_INPUT_BUFFER_PADDING_SIZE); |
|
|
|
nal->data = dst; |
|
nal->size = di; |
|
nal->raw_data = src; |
|
nal->raw_size = si; |
|
rbsp->rbsp_buffer_size += si; |
|
|
|
return si; |
|
} |
|
|
|
static const char *const hevc_nal_type_name[64] = { |
|
"TRAIL_N", // HEVC_NAL_TRAIL_N |
|
"TRAIL_R", // HEVC_NAL_TRAIL_R |
|
"TSA_N", // HEVC_NAL_TSA_N |
|
"TSA_R", // HEVC_NAL_TSA_R |
|
"STSA_N", // HEVC_NAL_STSA_N |
|
"STSA_R", // HEVC_NAL_STSA_R |
|
"RADL_N", // HEVC_NAL_RADL_N |
|
"RADL_R", // HEVC_NAL_RADL_R |
|
"RASL_N", // HEVC_NAL_RASL_N |
|
"RASL_R", // HEVC_NAL_RASL_R |
|
"RSV_VCL_N10", // HEVC_NAL_VCL_N10 |
|
"RSV_VCL_R11", // HEVC_NAL_VCL_R11 |
|
"RSV_VCL_N12", // HEVC_NAL_VCL_N12 |
|
"RSV_VLC_R13", // HEVC_NAL_VCL_R13 |
|
"RSV_VCL_N14", // HEVC_NAL_VCL_N14 |
|
"RSV_VCL_R15", // HEVC_NAL_VCL_R15 |
|
"BLA_W_LP", // HEVC_NAL_BLA_W_LP |
|
"BLA_W_RADL", // HEVC_NAL_BLA_W_RADL |
|
"BLA_N_LP", // HEVC_NAL_BLA_N_LP |
|
"IDR_W_RADL", // HEVC_NAL_IDR_W_RADL |
|
"IDR_N_LP", // HEVC_NAL_IDR_N_LP |
|
"CRA_NUT", // HEVC_NAL_CRA_NUT |
|
"RSV_IRAP_VCL22", // HEVC_NAL_RSV_IRAP_VCL22 |
|
"RSV_IRAP_VCL23", // HEVC_NAL_RSV_IRAP_VCL23 |
|
"RSV_VCL24", // HEVC_NAL_RSV_VCL24 |
|
"RSV_VCL25", // HEVC_NAL_RSV_VCL25 |
|
"RSV_VCL26", // HEVC_NAL_RSV_VCL26 |
|
"RSV_VCL27", // HEVC_NAL_RSV_VCL27 |
|
"RSV_VCL28", // HEVC_NAL_RSV_VCL28 |
|
"RSV_VCL29", // HEVC_NAL_RSV_VCL29 |
|
"RSV_VCL30", // HEVC_NAL_RSV_VCL30 |
|
"RSV_VCL31", // HEVC_NAL_RSV_VCL31 |
|
"VPS", // HEVC_NAL_VPS |
|
"SPS", // HEVC_NAL_SPS |
|
"PPS", // HEVC_NAL_PPS |
|
"AUD", // HEVC_NAL_AUD |
|
"EOS_NUT", // HEVC_NAL_EOS_NUT |
|
"EOB_NUT", // HEVC_NAL_EOB_NUT |
|
"FD_NUT", // HEVC_NAL_FD_NUT |
|
"SEI_PREFIX", // HEVC_NAL_SEI_PREFIX |
|
"SEI_SUFFIX", // HEVC_NAL_SEI_SUFFIX |
|
"RSV_NVCL41", // HEVC_NAL_RSV_NVCL41 |
|
"RSV_NVCL42", // HEVC_NAL_RSV_NVCL42 |
|
"RSV_NVCL43", // HEVC_NAL_RSV_NVCL43 |
|
"RSV_NVCL44", // HEVC_NAL_RSV_NVCL44 |
|
"RSV_NVCL45", // HEVC_NAL_RSV_NVCL45 |
|
"RSV_NVCL46", // HEVC_NAL_RSV_NVCL46 |
|
"RSV_NVCL47", // HEVC_NAL_RSV_NVCL47 |
|
"UNSPEC48", // HEVC_NAL_UNSPEC48 |
|
"UNSPEC49", // HEVC_NAL_UNSPEC49 |
|
"UNSPEC50", // HEVC_NAL_UNSPEC50 |
|
"UNSPEC51", // HEVC_NAL_UNSPEC51 |
|
"UNSPEC52", // HEVC_NAL_UNSPEC52 |
|
"UNSPEC53", // HEVC_NAL_UNSPEC53 |
|
"UNSPEC54", // HEVC_NAL_UNSPEC54 |
|
"UNSPEC55", // HEVC_NAL_UNSPEC55 |
|
"UNSPEC56", // HEVC_NAL_UNSPEC56 |
|
"UNSPEC57", // HEVC_NAL_UNSPEC57 |
|
"UNSPEC58", // HEVC_NAL_UNSPEC58 |
|
"UNSPEC59", // HEVC_NAL_UNSPEC59 |
|
"UNSPEC60", // HEVC_NAL_UNSPEC60 |
|
"UNSPEC61", // HEVC_NAL_UNSPEC61 |
|
"UNSPEC62", // HEVC_NAL_UNSPEC62 |
|
"UNSPEC63", // HEVC_NAL_UNSPEC63 |
|
}; |
|
|
|
static const char *hevc_nal_unit_name(int nal_type) |
|
{ |
|
av_assert0(nal_type >= 0 && nal_type < 64); |
|
return hevc_nal_type_name[nal_type]; |
|
} |
|
|
|
static const char *const h264_nal_type_name[32] = { |
|
"Unspecified 0", //H264_NAL_UNSPECIFIED |
|
"Coded slice of a non-IDR picture", // H264_NAL_SLICE |
|
"Coded slice data partition A", // H264_NAL_DPA |
|
"Coded slice data partition B", // H264_NAL_DPB |
|
"Coded slice data partition C", // H264_NAL_DPC |
|
"IDR", // H264_NAL_IDR_SLICE |
|
"SEI", // H264_NAL_SEI |
|
"SPS", // H264_NAL_SPS |
|
"PPS", // H264_NAL_PPS |
|
"AUD", // H264_NAL_AUD |
|
"End of sequence", // H264_NAL_END_SEQUENCE |
|
"End of stream", // H264_NAL_END_STREAM |
|
"Filler data", // H264_NAL_FILLER_DATA |
|
"SPS extension", // H264_NAL_SPS_EXT |
|
"Prefix", // H264_NAL_PREFIX |
|
"Subset SPS", // H264_NAL_SUB_SPS |
|
"Depth parameter set", // H264_NAL_DPS |
|
"Reserved 17", // H264_NAL_RESERVED17 |
|
"Reserved 18", // H264_NAL_RESERVED18 |
|
"Auxiliary coded picture without partitioning", // H264_NAL_AUXILIARY_SLICE |
|
"Slice extension", // H264_NAL_EXTEN_SLICE |
|
"Slice extension for a depth view or a 3D-AVC texture view", // H264_NAL_DEPTH_EXTEN_SLICE |
|
"Reserved 22", // H264_NAL_RESERVED22 |
|
"Reserved 23", // H264_NAL_RESERVED23 |
|
"Unspecified 24", // H264_NAL_UNSPECIFIED24 |
|
"Unspecified 25", // H264_NAL_UNSPECIFIED25 |
|
"Unspecified 26", // H264_NAL_UNSPECIFIED26 |
|
"Unspecified 27", // H264_NAL_UNSPECIFIED27 |
|
"Unspecified 28", // H264_NAL_UNSPECIFIED28 |
|
"Unspecified 29", // H264_NAL_UNSPECIFIED29 |
|
"Unspecified 30", // H264_NAL_UNSPECIFIED30 |
|
"Unspecified 31", // H264_NAL_UNSPECIFIED31 |
|
}; |
|
|
|
static const char *h264_nal_unit_name(int nal_type) |
|
{ |
|
av_assert0(nal_type >= 0 && nal_type < 32); |
|
return h264_nal_type_name[nal_type]; |
|
} |
|
|
|
static int get_bit_length(H2645NAL *nal, int skip_trailing_zeros) |
|
{ |
|
int size = nal->size; |
|
int v; |
|
|
|
while (skip_trailing_zeros && size > 0 && nal->data[size - 1] == 0) |
|
size--; |
|
|
|
if (!size) |
|
return 0; |
|
|
|
v = nal->data[size - 1]; |
|
|
|
if (size > INT_MAX / 8) |
|
return AVERROR(ERANGE); |
|
size *= 8; |
|
|
|
/* remove the stop bit and following trailing zeros, |
|
* or nothing for damaged bitstreams */ |
|
if (v) |
|
size -= ff_ctz(v) + 1; |
|
|
|
return size; |
|
} |
|
|
|
/** |
|
* @return AVERROR_INVALIDDATA if the packet is not a valid NAL unit, |
|
* 0 otherwise |
|
*/ |
|
static int hevc_parse_nal_header(H2645NAL *nal, void *logctx) |
|
{ |
|
GetBitContext *gb = &nal->gb; |
|
|
|
if (get_bits1(gb) != 0) |
|
return AVERROR_INVALIDDATA; |
|
|
|
nal->type = get_bits(gb, 6); |
|
|
|
nal->nuh_layer_id = get_bits(gb, 6); |
|
nal->temporal_id = get_bits(gb, 3) - 1; |
|
if (nal->temporal_id < 0) |
|
return AVERROR_INVALIDDATA; |
|
|
|
av_log(logctx, AV_LOG_DEBUG, |
|
"nal_unit_type: %d(%s), nuh_layer_id: %d, temporal_id: %d\n", |
|
nal->type, hevc_nal_unit_name(nal->type), nal->nuh_layer_id, nal->temporal_id); |
|
|
|
return 0; |
|
} |
|
|
|
static int h264_parse_nal_header(H2645NAL *nal, void *logctx) |
|
{ |
|
GetBitContext *gb = &nal->gb; |
|
|
|
if (get_bits1(gb) != 0) |
|
return AVERROR_INVALIDDATA; |
|
|
|
nal->ref_idc = get_bits(gb, 2); |
|
nal->type = get_bits(gb, 5); |
|
|
|
av_log(logctx, AV_LOG_DEBUG, |
|
"nal_unit_type: %d(%s), nal_ref_idc: %d\n", |
|
nal->type, h264_nal_unit_name(nal->type), nal->ref_idc); |
|
|
|
return 0; |
|
} |
|
|
|
static int find_next_start_code(const uint8_t *buf, const uint8_t *next_avc) |
|
{ |
|
int i = 0; |
|
|
|
if (buf + 3 >= next_avc) |
|
return next_avc - buf; |
|
|
|
while (buf + i + 3 < next_avc) { |
|
if (buf[i] == 0 && buf[i + 1] == 0 && buf[i + 2] == 1) |
|
break; |
|
i++; |
|
} |
|
return i + 3; |
|
} |
|
|
|
static void alloc_rbsp_buffer(H2645RBSP *rbsp, unsigned int size, int use_ref) |
|
{ |
|
int min_size = size; |
|
|
|
if (size > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE) |
|
goto fail; |
|
size += AV_INPUT_BUFFER_PADDING_SIZE; |
|
|
|
if (rbsp->rbsp_buffer_alloc_size >= size && |
|
(!rbsp->rbsp_buffer_ref || av_buffer_is_writable(rbsp->rbsp_buffer_ref))) { |
|
av_assert0(rbsp->rbsp_buffer); |
|
memset(rbsp->rbsp_buffer + min_size, 0, AV_INPUT_BUFFER_PADDING_SIZE); |
|
return; |
|
} |
|
|
|
size = FFMIN(size + size / 16 + 32, INT_MAX); |
|
|
|
if (rbsp->rbsp_buffer_ref) |
|
av_buffer_unref(&rbsp->rbsp_buffer_ref); |
|
else |
|
av_free(rbsp->rbsp_buffer); |
|
|
|
rbsp->rbsp_buffer = av_mallocz(size); |
|
if (!rbsp->rbsp_buffer) |
|
goto fail; |
|
rbsp->rbsp_buffer_alloc_size = size; |
|
|
|
if (use_ref) { |
|
rbsp->rbsp_buffer_ref = av_buffer_create(rbsp->rbsp_buffer, size, |
|
NULL, NULL, 0); |
|
if (!rbsp->rbsp_buffer_ref) |
|
goto fail; |
|
} |
|
|
|
return; |
|
|
|
fail: |
|
rbsp->rbsp_buffer_alloc_size = 0; |
|
if (rbsp->rbsp_buffer_ref) { |
|
av_buffer_unref(&rbsp->rbsp_buffer_ref); |
|
rbsp->rbsp_buffer = NULL; |
|
} else |
|
av_freep(&rbsp->rbsp_buffer); |
|
|
|
return; |
|
} |
|
|
|
int ff_h2645_packet_split(H2645Packet *pkt, const uint8_t *buf, int length, |
|
void *logctx, int is_nalff, int nal_length_size, |
|
enum AVCodecID codec_id, int small_padding, int use_ref) |
|
{ |
|
GetByteContext bc; |
|
int consumed, ret = 0; |
|
int next_avc = is_nalff ? 0 : length; |
|
int64_t padding = small_padding ? 0 : MAX_MBPAIR_SIZE; |
|
|
|
bytestream2_init(&bc, buf, length); |
|
alloc_rbsp_buffer(&pkt->rbsp, length + padding, use_ref); |
|
|
|
if (!pkt->rbsp.rbsp_buffer) |
|
return AVERROR(ENOMEM); |
|
|
|
pkt->rbsp.rbsp_buffer_size = 0; |
|
pkt->nb_nals = 0; |
|
while (bytestream2_get_bytes_left(&bc) >= 4) { |
|
H2645NAL *nal; |
|
int extract_length = 0; |
|
int skip_trailing_zeros = 1; |
|
|
|
if (bytestream2_tell(&bc) == next_avc) { |
|
int i = 0; |
|
extract_length = get_nalsize(nal_length_size, |
|
bc.buffer, bytestream2_get_bytes_left(&bc), &i, logctx); |
|
if (extract_length < 0) |
|
return extract_length; |
|
|
|
bytestream2_skip(&bc, nal_length_size); |
|
|
|
next_avc = bytestream2_tell(&bc) + extract_length; |
|
} else { |
|
int buf_index; |
|
|
|
if (bytestream2_tell(&bc) > next_avc) |
|
av_log(logctx, AV_LOG_WARNING, "Exceeded next NALFF position, re-syncing.\n"); |
|
|
|
/* search start code */ |
|
buf_index = find_next_start_code(bc.buffer, buf + next_avc); |
|
|
|
bytestream2_skip(&bc, buf_index); |
|
|
|
if (!bytestream2_get_bytes_left(&bc)) { |
|
if (pkt->nb_nals > 0) { |
|
// No more start codes: we discarded some irrelevant |
|
// bytes at the end of the packet. |
|
return 0; |
|
} else { |
|
av_log(logctx, AV_LOG_ERROR, "No start code is found.\n"); |
|
return AVERROR_INVALIDDATA; |
|
} |
|
} |
|
|
|
extract_length = FFMIN(bytestream2_get_bytes_left(&bc), next_avc - bytestream2_tell(&bc)); |
|
|
|
if (bytestream2_tell(&bc) >= next_avc) { |
|
/* skip to the start of the next NAL */ |
|
bytestream2_skip(&bc, next_avc - bytestream2_tell(&bc)); |
|
continue; |
|
} |
|
} |
|
|
|
if (pkt->nals_allocated < pkt->nb_nals + 1) { |
|
int new_size = pkt->nals_allocated + 1; |
|
void *tmp; |
|
|
|
if (new_size >= INT_MAX / sizeof(*pkt->nals)) |
|
return AVERROR(ENOMEM); |
|
|
|
tmp = av_fast_realloc(pkt->nals, &pkt->nal_buffer_size, new_size * sizeof(*pkt->nals)); |
|
if (!tmp) |
|
return AVERROR(ENOMEM); |
|
|
|
pkt->nals = tmp; |
|
memset(pkt->nals + pkt->nals_allocated, 0, sizeof(*pkt->nals)); |
|
|
|
nal = &pkt->nals[pkt->nb_nals]; |
|
nal->skipped_bytes_pos_size = 1024; // initial buffer size |
|
nal->skipped_bytes_pos = av_malloc_array(nal->skipped_bytes_pos_size, sizeof(*nal->skipped_bytes_pos)); |
|
if (!nal->skipped_bytes_pos) |
|
return AVERROR(ENOMEM); |
|
|
|
pkt->nals_allocated = new_size; |
|
} |
|
nal = &pkt->nals[pkt->nb_nals]; |
|
|
|
consumed = ff_h2645_extract_rbsp(bc.buffer, extract_length, &pkt->rbsp, nal, small_padding); |
|
if (consumed < 0) |
|
return consumed; |
|
|
|
if (is_nalff && (extract_length != consumed) && extract_length) |
|
av_log(logctx, AV_LOG_DEBUG, |
|
"NALFF: Consumed only %d bytes instead of %d\n", |
|
consumed, extract_length); |
|
|
|
bytestream2_skip(&bc, consumed); |
|
|
|
/* see commit 3566042a0 */ |
|
if (bytestream2_get_bytes_left(&bc) >= 4 && |
|
bytestream2_peek_be32(&bc) == 0x000001E0) |
|
skip_trailing_zeros = 0; |
|
|
|
nal->size_bits = get_bit_length(nal, skip_trailing_zeros); |
|
|
|
if (nal->size <= 0 || nal->size_bits <= 0) |
|
continue; |
|
|
|
ret = init_get_bits(&nal->gb, nal->data, nal->size_bits); |
|
if (ret < 0) |
|
return ret; |
|
|
|
/* Reset type in case it contains a stale value from a previously parsed NAL */ |
|
nal->type = 0; |
|
|
|
if (codec_id == AV_CODEC_ID_HEVC) |
|
ret = hevc_parse_nal_header(nal, logctx); |
|
else |
|
ret = h264_parse_nal_header(nal, logctx); |
|
if (ret < 0) { |
|
av_log(logctx, AV_LOG_WARNING, "Invalid NAL unit %d, skipping.\n", |
|
nal->type); |
|
continue; |
|
} |
|
|
|
pkt->nb_nals++; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
void ff_h2645_packet_uninit(H2645Packet *pkt) |
|
{ |
|
int i; |
|
for (i = 0; i < pkt->nals_allocated; i++) { |
|
av_freep(&pkt->nals[i].skipped_bytes_pos); |
|
} |
|
av_freep(&pkt->nals); |
|
pkt->nals_allocated = pkt->nal_buffer_size = 0; |
|
if (pkt->rbsp.rbsp_buffer_ref) { |
|
av_buffer_unref(&pkt->rbsp.rbsp_buffer_ref); |
|
pkt->rbsp.rbsp_buffer = NULL; |
|
} else |
|
av_freep(&pkt->rbsp.rbsp_buffer); |
|
pkt->rbsp.rbsp_buffer_alloc_size = pkt->rbsp.rbsp_buffer_size = 0; |
|
}
|
|
|