mirror of
https://github.com/FFmpeg/FFmpeg.git
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480 lines
15 KiB
C
480 lines
15 KiB
C
/*
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* H.264/HEVC common parsing code
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <string.h>
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#include "config.h"
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#include "libavutil/intmath.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/mem.h"
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#include "bytestream.h"
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#include "hevc.h"
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#include "h264.h"
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#include "h2645_parse.h"
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int ff_h2645_extract_rbsp(const uint8_t *src, int length,
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H2645RBSP *rbsp, H2645NAL *nal, int small_padding)
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{
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int i, si, di;
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uint8_t *dst;
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nal->skipped_bytes = 0;
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#define STARTCODE_TEST \
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if (i + 2 < length && src[i + 1] == 0 && src[i + 2] <= 3) { \
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if (src[i + 2] != 3 && src[i + 2] != 0) { \
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/* startcode, so we must be past the end */ \
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length = i; \
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} \
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break; \
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}
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#if HAVE_FAST_UNALIGNED
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#define FIND_FIRST_ZERO \
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if (i > 0 && !src[i]) \
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i--; \
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while (src[i]) \
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i++
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#if HAVE_FAST_64BIT
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for (i = 0; i + 1 < length; i += 9) {
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if (!((~AV_RN64(src + i) &
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(AV_RN64(src + i) - 0x0100010001000101ULL)) &
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0x8000800080008080ULL))
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continue;
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FIND_FIRST_ZERO;
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STARTCODE_TEST;
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i -= 7;
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}
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#else
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for (i = 0; i + 1 < length; i += 5) {
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if (!((~AV_RN32(src + i) &
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(AV_RN32(src + i) - 0x01000101U)) &
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0x80008080U))
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continue;
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FIND_FIRST_ZERO;
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STARTCODE_TEST;
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i -= 3;
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}
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#endif /* HAVE_FAST_64BIT */
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#else
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for (i = 0; i + 1 < length; i += 2) {
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if (src[i])
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continue;
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if (i > 0 && src[i - 1] == 0)
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i--;
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STARTCODE_TEST;
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}
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#endif /* HAVE_FAST_UNALIGNED */
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if (i >= length - 1 && small_padding) { // no escaped 0
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nal->data =
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nal->raw_data = src;
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nal->size =
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nal->raw_size = length;
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return length;
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} else if (i > length)
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i = length;
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nal->rbsp_buffer = &rbsp->rbsp_buffer[rbsp->rbsp_buffer_size];
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dst = nal->rbsp_buffer;
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memcpy(dst, src, i);
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si = di = i;
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while (si + 2 < length) {
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// remove escapes (very rare 1:2^22)
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if (src[si + 2] > 3) {
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dst[di++] = src[si++];
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dst[di++] = src[si++];
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} else if (src[si] == 0 && src[si + 1] == 0 && src[si + 2] != 0) {
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if (src[si + 2] == 3) { // escape
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dst[di++] = 0;
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dst[di++] = 0;
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si += 3;
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if (nal->skipped_bytes_pos) {
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nal->skipped_bytes++;
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if (nal->skipped_bytes_pos_size < nal->skipped_bytes) {
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nal->skipped_bytes_pos_size *= 2;
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av_assert0(nal->skipped_bytes_pos_size >= nal->skipped_bytes);
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av_reallocp_array(&nal->skipped_bytes_pos,
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nal->skipped_bytes_pos_size,
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sizeof(*nal->skipped_bytes_pos));
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if (!nal->skipped_bytes_pos) {
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nal->skipped_bytes_pos_size = 0;
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return AVERROR(ENOMEM);
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}
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}
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if (nal->skipped_bytes_pos)
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nal->skipped_bytes_pos[nal->skipped_bytes-1] = di - 1;
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}
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continue;
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} else // next start code
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goto nsc;
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}
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dst[di++] = src[si++];
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}
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while (si < length)
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dst[di++] = src[si++];
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nsc:
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memset(dst + di, 0, AV_INPUT_BUFFER_PADDING_SIZE);
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nal->data = dst;
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nal->size = di;
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nal->raw_data = src;
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nal->raw_size = si;
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rbsp->rbsp_buffer_size += si;
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return si;
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}
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static const char *hevc_nal_type_name[64] = {
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"TRAIL_N", // HEVC_NAL_TRAIL_N
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"TRAIL_R", // HEVC_NAL_TRAIL_R
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"TSA_N", // HEVC_NAL_TSA_N
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"TSA_R", // HEVC_NAL_TSA_R
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"STSA_N", // HEVC_NAL_STSA_N
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"STSA_R", // HEVC_NAL_STSA_R
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"RADL_N", // HEVC_NAL_RADL_N
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"RADL_R", // HEVC_NAL_RADL_R
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"RASL_N", // HEVC_NAL_RASL_N
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"RASL_R", // HEVC_NAL_RASL_R
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"RSV_VCL_N10", // HEVC_NAL_VCL_N10
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"RSV_VCL_R11", // HEVC_NAL_VCL_R11
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"RSV_VCL_N12", // HEVC_NAL_VCL_N12
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"RSV_VLC_R13", // HEVC_NAL_VCL_R13
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"RSV_VCL_N14", // HEVC_NAL_VCL_N14
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"RSV_VCL_R15", // HEVC_NAL_VCL_R15
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"BLA_W_LP", // HEVC_NAL_BLA_W_LP
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"BLA_W_RADL", // HEVC_NAL_BLA_W_RADL
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"BLA_N_LP", // HEVC_NAL_BLA_N_LP
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"IDR_W_RADL", // HEVC_NAL_IDR_W_RADL
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"IDR_N_LP", // HEVC_NAL_IDR_N_LP
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"CRA_NUT", // HEVC_NAL_CRA_NUT
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"IRAP_IRAP_VCL22", // HEVC_NAL_IRAP_VCL22
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"IRAP_IRAP_VCL23", // HEVC_NAL_IRAP_VCL23
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"RSV_VCL24", // HEVC_NAL_RSV_VCL24
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"RSV_VCL25", // HEVC_NAL_RSV_VCL25
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"RSV_VCL26", // HEVC_NAL_RSV_VCL26
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"RSV_VCL27", // HEVC_NAL_RSV_VCL27
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"RSV_VCL28", // HEVC_NAL_RSV_VCL28
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"RSV_VCL29", // HEVC_NAL_RSV_VCL29
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"RSV_VCL30", // HEVC_NAL_RSV_VCL30
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"RSV_VCL31", // HEVC_NAL_RSV_VCL31
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"VPS", // HEVC_NAL_VPS
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"SPS", // HEVC_NAL_SPS
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"PPS", // HEVC_NAL_PPS
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"AUD", // HEVC_NAL_AUD
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"EOS_NUT", // HEVC_NAL_EOS_NUT
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"EOB_NUT", // HEVC_NAL_EOB_NUT
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"FD_NUT", // HEVC_NAL_FD_NUT
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"SEI_PREFIX", // HEVC_NAL_SEI_PREFIX
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"SEI_SUFFIX", // HEVC_NAL_SEI_SUFFIX
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"RSV_NVCL41", // HEVC_NAL_RSV_NVCL41
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"RSV_NVCL42", // HEVC_NAL_RSV_NVCL42
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"RSV_NVCL43", // HEVC_NAL_RSV_NVCL43
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"RSV_NVCL44", // HEVC_NAL_RSV_NVCL44
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"RSV_NVCL45", // HEVC_NAL_RSV_NVCL45
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"RSV_NVCL46", // HEVC_NAL_RSV_NVCL46
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"RSV_NVCL47", // HEVC_NAL_RSV_NVCL47
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"UNSPEC48", // HEVC_NAL_UNSPEC48
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"UNSPEC49", // HEVC_NAL_UNSPEC49
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"UNSPEC50", // HEVC_NAL_UNSPEC50
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"UNSPEC51", // HEVC_NAL_UNSPEC51
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"UNSPEC52", // HEVC_NAL_UNSPEC52
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"UNSPEC53", // HEVC_NAL_UNSPEC53
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"UNSPEC54", // HEVC_NAL_UNSPEC54
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"UNSPEC55", // HEVC_NAL_UNSPEC55
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"UNSPEC56", // HEVC_NAL_UNSPEC56
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"UNSPEC57", // HEVC_NAL_UNSPEC57
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"UNSPEC58", // HEVC_NAL_UNSPEC58
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"UNSPEC59", // HEVC_NAL_UNSPEC59
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"UNSPEC60", // HEVC_NAL_UNSPEC60
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"UNSPEC61", // HEVC_NAL_UNSPEC61
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"UNSPEC62", // HEVC_NAL_UNSPEC62
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"UNSPEC63", // HEVC_NAL_UNSPEC63
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};
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static const char *hevc_nal_unit_name(int nal_type)
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{
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av_assert0(nal_type >= 0 && nal_type < 64);
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return hevc_nal_type_name[nal_type];
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}
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static const char *h264_nal_type_name[32] = {
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"Unspecified 0", //H264_NAL_UNSPECIFIED
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"Coded slice of a non-IDR picture", // H264_NAL_SLICE
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"Coded slice data partition A", // H264_NAL_DPA
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"Coded slice data partition B", // H264_NAL_DPB
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"Coded slice data partition C", // H264_NAL_DPC
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"IDR", // H264_NAL_IDR_SLICE
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"SEI", // H264_NAL_SEI
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"SPS", // H264_NAL_SPS
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"PPS", // H264_NAL_PPS
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"AUD", // H264_NAL_AUD
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"End of sequence", // H264_NAL_END_SEQUENCE
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"End of stream", // H264_NAL_END_STREAM
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"Filler data", // H264_NAL_FILLER_DATA
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"SPS extension", // H264_NAL_SPS_EXT
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"Prefix", // H264_NAL_PREFIX
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"Subset SPS", // H264_NAL_SUB_SPS
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"Depth parameter set", // H264_NAL_DPS
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"Reserved 17", // H264_NAL_RESERVED17
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"Reserved 18", // H264_NAL_RESERVED18
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"Auxiliary coded picture without partitioning", // H264_NAL_AUXILIARY_SLICE
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"Slice extension", // H264_NAL_EXTEN_SLICE
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"Slice extension for a depth view or a 3D-AVC texture view", // H264_NAL_DEPTH_EXTEN_SLICE
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"Reserved 22", // H264_NAL_RESERVED22
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"Reserved 23", // H264_NAL_RESERVED23
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"Unspecified 24", // H264_NAL_UNSPECIFIED24
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"Unspecified 25", // H264_NAL_UNSPECIFIED25
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"Unspecified 26", // H264_NAL_UNSPECIFIED26
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"Unspecified 27", // H264_NAL_UNSPECIFIED27
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"Unspecified 28", // H264_NAL_UNSPECIFIED28
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"Unspecified 29", // H264_NAL_UNSPECIFIED29
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"Unspecified 30", // H264_NAL_UNSPECIFIED30
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"Unspecified 31", // H264_NAL_UNSPECIFIED31
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};
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static const char *h264_nal_unit_name(int nal_type)
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{
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av_assert0(nal_type >= 0 && nal_type < 32);
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return h264_nal_type_name[nal_type];
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}
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static int get_bit_length(H2645NAL *nal, int skip_trailing_zeros)
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{
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int size = nal->size;
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int v;
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while (skip_trailing_zeros && size > 0 && nal->data[size - 1] == 0)
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size--;
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if (!size)
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return 0;
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v = nal->data[size - 1];
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if (size > INT_MAX / 8)
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return AVERROR(ERANGE);
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size *= 8;
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/* remove the stop bit and following trailing zeros,
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* or nothing for damaged bitstreams */
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if (v)
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size -= ff_ctz(v) + 1;
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return size;
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}
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/**
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* @return AVERROR_INVALIDDATA if the packet is not a valid NAL unit,
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* 0 if the unit should be skipped, 1 otherwise
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*/
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static int hevc_parse_nal_header(H2645NAL *nal, void *logctx)
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{
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GetBitContext *gb = &nal->gb;
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int nuh_layer_id;
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if (get_bits1(gb) != 0)
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return AVERROR_INVALIDDATA;
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nal->type = get_bits(gb, 6);
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nuh_layer_id = get_bits(gb, 6);
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nal->temporal_id = get_bits(gb, 3) - 1;
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if (nal->temporal_id < 0)
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return AVERROR_INVALIDDATA;
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av_log(logctx, AV_LOG_DEBUG,
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"nal_unit_type: %d(%s), nuh_layer_id: %d, temporal_id: %d\n",
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nal->type, hevc_nal_unit_name(nal->type), nuh_layer_id, nal->temporal_id);
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return nuh_layer_id == 0;
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}
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static int h264_parse_nal_header(H2645NAL *nal, void *logctx)
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{
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GetBitContext *gb = &nal->gb;
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if (get_bits1(gb) != 0)
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return AVERROR_INVALIDDATA;
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nal->ref_idc = get_bits(gb, 2);
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nal->type = get_bits(gb, 5);
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av_log(logctx, AV_LOG_DEBUG,
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"nal_unit_type: %d(%s), nal_ref_idc: %d\n",
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nal->type, h264_nal_unit_name(nal->type), nal->ref_idc);
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return 1;
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}
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static int find_next_start_code(const uint8_t *buf, const uint8_t *next_avc)
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{
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int i = 0;
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if (buf + 3 >= next_avc)
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return next_avc - buf;
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while (buf + i + 3 < next_avc) {
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if (buf[i] == 0 && buf[i + 1] == 0 && buf[i + 2] == 1)
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break;
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i++;
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}
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return i + 3;
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}
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int ff_h2645_packet_split(H2645Packet *pkt, const uint8_t *buf, int length,
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void *logctx, int is_nalff, int nal_length_size,
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enum AVCodecID codec_id, int small_padding)
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{
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GetByteContext bc;
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int consumed, ret = 0;
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int next_avc = is_nalff ? 0 : length;
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int64_t padding = small_padding ? 0 : MAX_MBPAIR_SIZE;
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bytestream2_init(&bc, buf, length);
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av_fast_padded_malloc(&pkt->rbsp.rbsp_buffer, &pkt->rbsp.rbsp_buffer_alloc_size, length + padding);
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if (!pkt->rbsp.rbsp_buffer)
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return AVERROR(ENOMEM);
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pkt->rbsp.rbsp_buffer_size = 0;
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pkt->nb_nals = 0;
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while (bytestream2_get_bytes_left(&bc) >= 4) {
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H2645NAL *nal;
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int extract_length = 0;
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int skip_trailing_zeros = 1;
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if (bytestream2_tell(&bc) == next_avc) {
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int i = 0;
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extract_length = get_nalsize(nal_length_size,
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bc.buffer, bytestream2_get_bytes_left(&bc), &i, logctx);
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if (extract_length < 0)
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return extract_length;
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bytestream2_skip(&bc, nal_length_size);
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next_avc = bytestream2_tell(&bc) + extract_length;
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} else {
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int buf_index;
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if (bytestream2_tell(&bc) > next_avc)
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av_log(logctx, AV_LOG_WARNING, "Exceeded next NALFF position, re-syncing.\n");
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/* search start code */
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buf_index = find_next_start_code(bc.buffer, buf + next_avc);
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bytestream2_skip(&bc, buf_index);
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if (!bytestream2_get_bytes_left(&bc)) {
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if (pkt->nb_nals > 0) {
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// No more start codes: we discarded some irrelevant
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// bytes at the end of the packet.
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return 0;
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} else {
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av_log(logctx, AV_LOG_ERROR, "No start code is found.\n");
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return AVERROR_INVALIDDATA;
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}
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}
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extract_length = FFMIN(bytestream2_get_bytes_left(&bc), next_avc - bytestream2_tell(&bc));
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if (bytestream2_tell(&bc) >= next_avc) {
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/* skip to the start of the next NAL */
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bytestream2_skip(&bc, next_avc - bytestream2_tell(&bc));
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continue;
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}
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}
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if (pkt->nals_allocated < pkt->nb_nals + 1) {
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int new_size = pkt->nals_allocated + 1;
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void *tmp = av_realloc_array(pkt->nals, new_size, sizeof(*pkt->nals));
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if (!tmp)
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return AVERROR(ENOMEM);
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pkt->nals = tmp;
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memset(pkt->nals + pkt->nals_allocated, 0,
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(new_size - pkt->nals_allocated) * sizeof(*pkt->nals));
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nal = &pkt->nals[pkt->nb_nals];
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nal->skipped_bytes_pos_size = 1024; // initial buffer size
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nal->skipped_bytes_pos = av_malloc_array(nal->skipped_bytes_pos_size, sizeof(*nal->skipped_bytes_pos));
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if (!nal->skipped_bytes_pos)
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return AVERROR(ENOMEM);
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pkt->nals_allocated = new_size;
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}
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nal = &pkt->nals[pkt->nb_nals];
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consumed = ff_h2645_extract_rbsp(bc.buffer, extract_length, &pkt->rbsp, nal, small_padding);
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if (consumed < 0)
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return consumed;
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if (is_nalff && (extract_length != consumed) && extract_length)
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av_log(logctx, AV_LOG_DEBUG,
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"NALFF: Consumed only %d bytes instead of %d\n",
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consumed, extract_length);
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pkt->nb_nals++;
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bytestream2_skip(&bc, consumed);
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/* see commit 3566042a0 */
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if (bytestream2_get_bytes_left(&bc) >= 4 &&
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bytestream2_peek_be32(&bc) == 0x000001E0)
|
|
skip_trailing_zeros = 0;
|
|
|
|
nal->size_bits = get_bit_length(nal, skip_trailing_zeros);
|
|
|
|
ret = init_get_bits(&nal->gb, nal->data, nal->size_bits);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
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 || nal->size <= 0 || nal->size_bits <= 0) {
|
|
if (ret < 0) {
|
|
av_log(logctx, AV_LOG_ERROR, "Invalid NAL unit %d, skipping.\n",
|
|
nal->type);
|
|
}
|
|
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 = 0;
|
|
av_freep(&pkt->rbsp.rbsp_buffer);
|
|
pkt->rbsp.rbsp_buffer_alloc_size = pkt->rbsp.rbsp_buffer_size = 0;
|
|
}
|