135 lines
4.6 KiB
C
135 lines
4.6 KiB
C
/*
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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 "bytestream.h"
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#include "h2645_parse.h"
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#include "hevc.h"
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#include "hevc_parse.h"
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static int hevc_decode_nal_units(const uint8_t *buf, int buf_size, HEVCParamSets *ps,
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int is_nalff, int nal_length_size, void *logctx)
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{
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int i;
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int ret = 0;
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H2645Packet pkt = { 0 };
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ret = ff_h2645_packet_split(&pkt, buf, buf_size, logctx, is_nalff, nal_length_size, AV_CODEC_ID_HEVC, 1);
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if (ret < 0) {
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goto done;
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}
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for (i = 0; i < pkt.nb_nals; i++) {
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H2645NAL *nal = &pkt.nals[i];
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/* ignore everything except parameter sets and VCL NALUs */
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switch (nal->type) {
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case NAL_VPS: ff_hevc_decode_nal_vps(&nal->gb, logctx, ps); break;
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case NAL_SPS: ff_hevc_decode_nal_sps(&nal->gb, logctx, ps, 1); break;
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case NAL_PPS: ff_hevc_decode_nal_pps(&nal->gb, logctx, ps); break;
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case NAL_TRAIL_R:
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case NAL_TRAIL_N:
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case NAL_TSA_N:
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case NAL_TSA_R:
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case NAL_STSA_N:
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case NAL_STSA_R:
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case NAL_BLA_W_LP:
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case NAL_BLA_W_RADL:
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case NAL_BLA_N_LP:
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case NAL_IDR_W_RADL:
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case NAL_IDR_N_LP:
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case NAL_CRA_NUT:
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case NAL_RADL_N:
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case NAL_RADL_R:
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case NAL_RASL_N:
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case NAL_RASL_R:
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av_log(logctx, AV_LOG_ERROR, "Invalid NAL unit: %d\n", nal->type);
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ret = AVERROR_INVALIDDATA;
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goto done;
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break;
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}
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}
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done:
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ff_h2645_packet_uninit(&pkt);
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return ret;
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}
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int ff_hevc_decode_extradata(const uint8_t *data, int size, HEVCParamSets *ps,
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int *is_nalff, int *nal_length_size,
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int err_recognition, void *logctx)
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{
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int ret = 0;
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GetByteContext gb;
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bytestream2_init(&gb, data, size);
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if (size > 3 && (data[0] || data[1] || data[2] > 1)) {
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/* It seems the extradata is encoded as hvcC format.
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* Temporarily, we support configurationVersion==0 until 14496-15 3rd
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* is finalized. When finalized, configurationVersion will be 1 and we
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* can recognize hvcC by checking if avctx->extradata[0]==1 or not. */
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int i, j, num_arrays, nal_len_size;
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*is_nalff = 1;
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bytestream2_skip(&gb, 21);
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nal_len_size = (bytestream2_get_byte(&gb) & 3) + 1;
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num_arrays = bytestream2_get_byte(&gb);
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/* nal units in the hvcC always have length coded with 2 bytes,
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* so put a fake nal_length_size = 2 while parsing them */
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*nal_length_size = 2;
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/* Decode nal units from hvcC. */
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for (i = 0; i < num_arrays; i++) {
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int type = bytestream2_get_byte(&gb) & 0x3f;
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int cnt = bytestream2_get_be16(&gb);
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for (j = 0; j < cnt; j++) {
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// +2 for the nal size field
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int nalsize = bytestream2_peek_be16(&gb) + 2;
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if (bytestream2_get_bytes_left(&gb) < nalsize) {
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av_log(logctx, AV_LOG_ERROR,
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"Invalid NAL unit size in extradata.\n");
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return AVERROR_INVALIDDATA;
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}
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ret = hevc_decode_nal_units(gb.buffer, nalsize, ps, *is_nalff, *nal_length_size, logctx);
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if (ret < 0) {
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av_log(logctx, AV_LOG_ERROR,
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"Decoding nal unit %d %d from hvcC failed\n",
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type, i);
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return ret;
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}
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bytestream2_skip(&gb, nalsize);
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}
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}
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/* Now store right nal length size, that will be used to parse
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* all other nals */
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*nal_length_size = nal_len_size;
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} else {
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*is_nalff = 0;
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ret = hevc_decode_nal_units(data, size, ps, *is_nalff, *nal_length_size, logctx);
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if (ret < 0)
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return ret;
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}
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return ret;
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}
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