298 lines
9.5 KiB
C
298 lines
9.5 KiB
C
/*
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* HEVC common 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/intreadwrite.h"
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#include "libavutil/mem.h"
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#include "hevc.h"
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/* FIXME: This is adapted from ff_h264_decode_nal, avoiding duplication
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* between these functions would be nice. */
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int ff_hevc_extract_rbsp(HEVCContext *s, const uint8_t *src, int length,
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HEVCNAL *nal)
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{
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int i, si, di;
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uint8_t *dst;
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if (s)
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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) { \
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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_RN64A(src + i) &
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(AV_RN64A(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_RN32A(src + i) &
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(AV_RN32A(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) { // 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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}
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av_fast_malloc(&nal->rbsp_buffer, &nal->rbsp_buffer_size,
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length + AV_INPUT_BUFFER_PADDING_SIZE);
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if (!nal->rbsp_buffer)
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return AVERROR(ENOMEM);
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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) {
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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 (s && 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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return si;
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}
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static const char *nal_unit_name(int nal_type)
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{
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switch(nal_type) {
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case NAL_TRAIL_N : return "TRAIL_N";
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case NAL_TRAIL_R : return "TRAIL_R";
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case NAL_TSA_N : return "TSA_N";
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case NAL_TSA_R : return "TSA_R";
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case NAL_STSA_N : return "STSA_N";
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case NAL_STSA_R : return "STSA_R";
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case NAL_RADL_N : return "RADL_N";
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case NAL_RADL_R : return "RADL_R";
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case NAL_RASL_N : return "RASL_N";
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case NAL_RASL_R : return "RASL_R";
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case NAL_BLA_W_LP : return "BLA_W_LP";
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case NAL_BLA_W_RADL : return "BLA_W_RADL";
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case NAL_BLA_N_LP : return "BLA_N_LP";
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case NAL_IDR_W_RADL : return "IDR_W_RADL";
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case NAL_IDR_N_LP : return "IDR_N_LP";
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case NAL_CRA_NUT : return "CRA_NUT";
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case NAL_VPS : return "VPS";
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case NAL_SPS : return "SPS";
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case NAL_PPS : return "PPS";
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case NAL_AUD : return "AUD";
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case NAL_EOS_NUT : return "EOS_NUT";
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case NAL_EOB_NUT : return "EOB_NUT";
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case NAL_FD_NUT : return "FD_NUT";
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case NAL_SEI_PREFIX : return "SEI_PREFIX";
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case NAL_SEI_SUFFIX : return "SEI_SUFFIX";
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default : return "?";
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}
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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 hls_nal_unit(HEVCNAL *nal, AVCodecContext *avctx)
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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(avctx, 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, 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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int ff_hevc_split_packet(HEVCContext *s, HEVCPacket *pkt, const uint8_t *buf, int length,
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AVCodecContext *avctx, int is_nalff, int nal_length_size)
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{
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int consumed, ret = 0;
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pkt->nb_nals = 0;
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while (length >= 4) {
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HEVCNAL *nal;
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int extract_length = 0;
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if (is_nalff) {
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int i;
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for (i = 0; i < nal_length_size; i++)
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extract_length = (extract_length << 8) | buf[i];
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buf += nal_length_size;
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length -= nal_length_size;
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if (extract_length > length) {
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av_log(avctx, AV_LOG_ERROR, "Invalid NAL unit size.\n");
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return AVERROR_INVALIDDATA;
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}
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} else {
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/* search start code */
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while (buf[0] != 0 || buf[1] != 0 || buf[2] != 1) {
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++buf;
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--length;
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if (length < 4) {
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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(avctx, 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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}
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buf += 3;
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length -= 3;
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extract_length = length;
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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_hevc_extract_rbsp(s, buf, extract_length, nal);
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if (consumed < 0)
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return consumed;
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pkt->nb_nals++;
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ret = init_get_bits8(&nal->gb, nal->data, nal->size);
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if (ret < 0)
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return ret;
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ret = hls_nal_unit(nal, avctx);
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if (ret <= 0) {
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if (ret < 0) {
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av_log(avctx, AV_LOG_ERROR, "Invalid NAL unit %d, skipping.\n",
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nal->type);
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}
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pkt->nb_nals--;
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}
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buf += consumed;
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length -= consumed;
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}
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return 0;
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}
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