/* * 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 #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 *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 "IRAP_IRAP_VCL22", // HEVC_NAL_IRAP_VCL22 "IRAP_IRAP_VCL23", // HEVC_NAL_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 *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 if the unit should be skipped, 1 otherwise */ static int hevc_parse_nal_header(H2645NAL *nal, void *logctx) { GetBitContext *gb = &nal->gb; int nuh_layer_id; if (get_bits1(gb) != 0) return AVERROR_INVALIDDATA; nal->type = get_bits(gb, 6); 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), nuh_layer_id, nal->temporal_id); return nuh_layer_id == 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 1; } 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 = av_realloc_array(pkt->nals, new_size, sizeof(*pkt->nals)); if (!tmp) return AVERROR(ENOMEM); pkt->nals = tmp; memset(pkt->nals + pkt->nals_allocated, 0, (new_size - pkt->nals_allocated) * 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); pkt->nb_nals++; 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); 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_WARNING, "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; 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; }