/* * 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 "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;    int flags = (H2645_FLAG_IS_NALFF * !!is_nalff) | H2645_FLAG_SMALL_PADDING;    H2645Packet pkt = { 0 };     ret = ff_h2645_packet_split(&pkt, buf, buf_size, logctx,                                nal_length_size, AV_CODEC_ID_HEVC, flags);    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,                                         nal->nuh_layer_id, 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);     /* data[0] == 1 is configurationVersion from 14496-15.     * data[0] == 0 is for backward compatibility predates the standard.     *     * Minimum number of bytes of hvcC with 0 numOfArrays is 23.     */    if (size >= 23 && ((data[0] == 1) || (data[0] == 0 && (data[1] || data[2] > 1)))) {        /* It seems the extradata is encoded as hvcC format. */        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;}