Showing the changes to libavcodec/hevc/parse.c (1 of 64 files). Show all
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| 1 | +/* | |
| 2 | + * This file is part of FFmpeg. | |
| 3 | + * | |
| 4 | + * FFmpeg is free software; you can redistribute it and/or | |
| 5 | + * modify it under the terms of the GNU Lesser General Public | |
| 6 | + * License as published by the Free Software Foundation; either | |
| 7 | + * version 2.1 of the License, or (at your option) any later version. | |
| 8 | + * | |
| 9 | + * FFmpeg is distributed in the hope that it will be useful, | |
| 10 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 12 | + * Lesser General Public License for more details. | |
| 13 | + * | |
| 14 | + * You should have received a copy of the GNU Lesser General Public | |
| 15 | + * License along with FFmpeg; if not, write to the Free Software | |
| 16 | + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| 17 | + */ | |
| 18 | + | |
| 19 | +#include "bytestream.h" | |
| 20 | +#include "h2645_parse.h" | |
| 21 | +#include "hevc.h" | |
| 22 | +#include "parse.h" | |
| 23 | + | |
| 24 | +static int hevc_decode_nal_units(const uint8_t *buf, int buf_size, HEVCParamSets *ps, | |
| 25 | + HEVCSEI *sei, int is_nalff, int nal_length_size, | |
| 26 | + int err_recognition, int apply_defdispwin, void *logctx) | |
| 27 | +{ | |
| 28 | + int i; | |
| 29 | + int ret = 0; | |
| 30 | + H2645Packet pkt = { 0 }; | |
| 31 | + | |
| 32 | + ret = ff_h2645_packet_split(&pkt, buf, buf_size, logctx, is_nalff, | |
| 33 | + nal_length_size, AV_CODEC_ID_HEVC, 1, 0); | |
| 34 | + if (ret < 0) { | |
| 35 | + goto done; | |
| 36 | + } | |
| 37 | + | |
| 38 | + for (i = 0; i < pkt.nb_nals; i++) { | |
| 39 | + H2645NAL *nal = &pkt.nals[i]; | |
| 40 | + if (nal->nuh_layer_id > 0) | |
| 41 | + continue; | |
| 42 | + | |
| 43 | + /* ignore everything except parameter sets and VCL NALUs */ | |
| 44 | + switch (nal->type) { | |
| 45 | + case HEVC_NAL_VPS: | |
| 46 | + ret = ff_hevc_decode_nal_vps(&nal->gb, logctx, ps); | |
| 47 | + if (ret < 0) | |
| 48 | + goto done; | |
| 49 | + break; | |
| 50 | + case HEVC_NAL_SPS: | |
| 51 | + ret = ff_hevc_decode_nal_sps(&nal->gb, logctx, ps, apply_defdispwin); | |
| 52 | + if (ret < 0) | |
| 53 | + goto done; | |
| 54 | + break; | |
| 55 | + case HEVC_NAL_PPS: | |
| 56 | + ret = ff_hevc_decode_nal_pps(&nal->gb, logctx, ps); | |
| 57 | + if (ret < 0) | |
| 58 | + goto done; | |
| 59 | + break; | |
| 60 | + case HEVC_NAL_SEI_PREFIX: | |
| 61 | + case HEVC_NAL_SEI_SUFFIX: | |
| 62 | + ret = ff_hevc_decode_nal_sei(&nal->gb, logctx, sei, ps, nal->type); | |
| 63 | + if (ret < 0) | |
| 64 | + goto done; | |
| 65 | + break; | |
| 66 | + default: | |
| 67 | + av_log(logctx, AV_LOG_VERBOSE, "Ignoring NAL type %d in extradata\n", nal->type); | |
| 68 | + break; | |
| 69 | + } | |
| 70 | + } | |
| 71 | + | |
| 72 | +done: | |
| 73 | + ff_h2645_packet_uninit(&pkt); | |
| 74 | + if (err_recognition & AV_EF_EXPLODE) | |
| 75 | + return ret; | |
| 76 | + | |
| 77 | + return 0; | |
| 78 | +} | |
| 79 | + | |
| 80 | +int ff_hevc_decode_extradata(const uint8_t *data, int size, HEVCParamSets *ps, | |
| 81 | + HEVCSEI *sei, int *is_nalff, int *nal_length_size, | |
| 82 | + int err_recognition, int apply_defdispwin, void *logctx) | |
| 83 | +{ | |
| 84 | + int ret = 0; | |
| 85 | + GetByteContext gb; | |
| 86 | + | |
| 87 | + bytestream2_init(&gb, data, size); | |
| 88 | + | |
| 89 | + /* data[0] == 1 is configurationVersion from 14496-15. | |
| 90 | + * data[0] == 0 is for backward compatibility predates the standard. | |
| 91 | + * | |
| 92 | + * Minimum number of bytes of hvcC with 0 numOfArrays is 23. | |
| 93 | + */ | |
| 94 | + if (size >= 23 && ((data[0] == 1) || (data[0] == 0 && (data[1] || data[2] > 1)))) { | |
| 95 | + /* It seems the extradata is encoded as hvcC format. */ | |
| 96 | + int i, j, num_arrays, nal_len_size; | |
| 97 | + | |
| 98 | + *is_nalff = 1; | |
| 99 | + | |
| 100 | + bytestream2_skip(&gb, 21); | |
| 101 | + nal_len_size = (bytestream2_get_byte(&gb) & 3) + 1; | |
| 102 | + num_arrays = bytestream2_get_byte(&gb); | |
| 103 | + | |
| 104 | + /* nal units in the hvcC always have length coded with 2 bytes, | |
| 105 | + * so put a fake nal_length_size = 2 while parsing them */ | |
| 106 | + *nal_length_size = 2; | |
| 107 | + | |
| 108 | + /* Decode nal units from hvcC. */ | |
| 109 | + for (i = 0; i < num_arrays; i++) { | |
| 110 | + int type = bytestream2_get_byte(&gb) & 0x3f; | |
| 111 | + int cnt = bytestream2_get_be16(&gb); | |
| 112 | + | |
| 113 | + for (j = 0; j < cnt; j++) { | |
| 114 | + // +2 for the nal size field | |
| 115 | + int nalsize = bytestream2_peek_be16(&gb) + 2; | |
| 116 | + if (bytestream2_get_bytes_left(&gb) < nalsize) { | |
| 117 | + av_log(logctx, AV_LOG_ERROR, | |
| 118 | + "Invalid NAL unit size in extradata.\n"); | |
| 119 | + return AVERROR_INVALIDDATA; | |
| 120 | + } | |
| 121 | + | |
| 122 | + ret = hevc_decode_nal_units(gb.buffer, nalsize, ps, sei, *is_nalff, | |
| 123 | + *nal_length_size, err_recognition, apply_defdispwin, | |
| 124 | + logctx); | |
| 125 | + if (ret < 0) { | |
| 126 | + av_log(logctx, AV_LOG_ERROR, | |
| 127 | + "Decoding nal unit %d %d from hvcC failed\n", | |
| 128 | + type, i); | |
| 129 | + return ret; | |
| 130 | + } | |
| 131 | + bytestream2_skip(&gb, nalsize); | |
| 132 | + } | |
| 133 | + } | |
| 134 | + | |
| 135 | + /* Now store right nal length size, that will be used to parse | |
| 136 | + * all other nals */ | |
| 137 | + *nal_length_size = nal_len_size; | |
| 138 | + } else { | |
| 139 | + *is_nalff = 0; | |
| 140 | + ret = hevc_decode_nal_units(data, size, ps, sei, *is_nalff, *nal_length_size, | |
| 141 | + err_recognition, apply_defdispwin, logctx); | |
| 142 | + if (ret < 0) | |
| 143 | + return ret; | |
| 144 | + } | |
| 145 | + | |
| 146 | + return ret; | |
| 147 | +} | |