diff options
Diffstat (limited to 'libavcodec/hevc_parse.c')
| -rw-r--r-- | libavcodec/hevc_parse.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/libavcodec/hevc_parse.c b/libavcodec/hevc_parse.c new file mode 100644 index 0000000000..dddb293df6 --- /dev/null +++ b/libavcodec/hevc_parse.c @@ -0,0 +1,143 @@ +/* + * 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 "bytestream.h" +#include "h2645_parse.h" +#include "hevc.h" +#include "hevc_parse.h" + +static int hevc_decode_nal_units(const uint8_t *buf, int buf_size, HEVCParamSets *ps, + HEVCSEI *sei, int is_nalff, int nal_length_size, + int err_recognition, int apply_defdispwin, void *logctx) +{ + int i; + int ret = 0; + H2645Packet pkt = { 0 }; + + ret = ff_h2645_packet_split(&pkt, buf, buf_size, logctx, is_nalff, + nal_length_size, AV_CODEC_ID_HEVC, 1, 0); + if (ret < 0) { + goto done; + } + + for (i = 0; i < pkt.nb_nals; i++) { + H2645NAL *nal = &pkt.nals[i]; + + /* ignore everything except parameter sets and VCL NALUs */ + switch (nal->type) { + case HEVC_NAL_VPS: + ret = ff_hevc_decode_nal_vps(&nal->gb, logctx, ps); + if (ret < 0) + goto done; + break; + case HEVC_NAL_SPS: + ret = ff_hevc_decode_nal_sps(&nal->gb, logctx, ps, apply_defdispwin); + if (ret < 0) + goto done; + break; + case HEVC_NAL_PPS: + ret = ff_hevc_decode_nal_pps(&nal->gb, logctx, ps); + if (ret < 0) + goto done; + break; + case HEVC_NAL_SEI_PREFIX: + case HEVC_NAL_SEI_SUFFIX: + ret = ff_hevc_decode_nal_sei(&nal->gb, logctx, sei, ps, nal->type); + if (ret < 0) + goto done; + break; + default: + av_log(logctx, AV_LOG_VERBOSE, "Ignoring NAL type %d in extradata\n", nal->type); + break; + } + } + +done: + ff_h2645_packet_uninit(&pkt); + if (err_recognition & AV_EF_EXPLODE) + return ret; + + return 0; +} + +int ff_hevc_decode_extradata(const uint8_t *data, int size, HEVCParamSets *ps, + HEVCSEI *sei, int *is_nalff, int *nal_length_size, + int err_recognition, int apply_defdispwin, void *logctx) +{ + int ret = 0; + GetByteContext gb; + + bytestream2_init(&gb, data, size); + + if (size > 3 && (data[0] || data[1] || data[2] > 1)) { + /* It seems the extradata is encoded as hvcC format. + * Temporarily, we support configurationVersion==0 until 14496-15 3rd + * is finalized. When finalized, configurationVersion will be 1 and we + * can recognize hvcC by checking if avctx->extradata[0]==1 or not. */ + int i, j, num_arrays, nal_len_size; + + *is_nalff = 1; + + bytestream2_skip(&gb, 21); + nal_len_size = (bytestream2_get_byte(&gb) & 3) + 1; + num_arrays = bytestream2_get_byte(&gb); + + /* nal units in the hvcC always have length coded with 2 bytes, + * so put a fake nal_length_size = 2 while parsing them */ + *nal_length_size = 2; + + /* Decode nal units from hvcC. */ + for (i = 0; i < num_arrays; i++) { + int type = bytestream2_get_byte(&gb) & 0x3f; + int cnt = bytestream2_get_be16(&gb); + + for (j = 0; j < cnt; j++) { + // +2 for the nal size field + int nalsize = bytestream2_peek_be16(&gb) + 2; + if (bytestream2_get_bytes_left(&gb) < nalsize) { + av_log(logctx, AV_LOG_ERROR, + "Invalid NAL unit size in extradata.\n"); + return AVERROR_INVALIDDATA; + } + + ret = hevc_decode_nal_units(gb.buffer, nalsize, ps, sei, *is_nalff, + *nal_length_size, err_recognition, apply_defdispwin, + logctx); + if (ret < 0) { + av_log(logctx, AV_LOG_ERROR, + "Decoding nal unit %d %d from hvcC failed\n", + type, i); + return ret; + } + bytestream2_skip(&gb, nalsize); + } + } + + /* Now store right nal length size, that will be used to parse + * all other nals */ + *nal_length_size = nal_len_size; + } else { + *is_nalff = 0; + ret = hevc_decode_nal_units(data, size, ps, sei, *is_nalff, *nal_length_size, + err_recognition, apply_defdispwin, logctx); + if (ret < 0) + return ret; + } + + return ret; +} |