mirror of
https://git.ffmpeg.org/ffmpeg.git
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552 lines
20 KiB
C
552 lines
20 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 "libavutil/mem.h"
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#include "bytestream.h"
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#include "get_bits.h"
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#include "golomb.h"
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#include "h264.h"
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#include "h264pred.h"
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#include "h264_parse.h"
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#include "h264_ps.h"
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#include "h2645_parse.h"
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#include "mpegutils.h"
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int ff_h264_pred_weight_table(GetBitContext *gb, const SPS *sps,
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const int *ref_count, int slice_type_nos,
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H264PredWeightTable *pwt,
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int picture_structure, void *logctx)
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{
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int list, i, j;
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int luma_def, chroma_def;
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pwt->use_weight = 0;
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pwt->use_weight_chroma = 0;
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pwt->luma_log2_weight_denom = get_ue_golomb_31(gb);
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if (pwt->luma_log2_weight_denom > 7U) {
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av_log(logctx, AV_LOG_ERROR, "luma_log2_weight_denom %d is out of range\n", pwt->luma_log2_weight_denom);
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pwt->luma_log2_weight_denom = 0;
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}
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luma_def = 1 << pwt->luma_log2_weight_denom;
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if (sps->chroma_format_idc) {
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pwt->chroma_log2_weight_denom = get_ue_golomb_31(gb);
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if (pwt->chroma_log2_weight_denom > 7U) {
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av_log(logctx, AV_LOG_ERROR, "chroma_log2_weight_denom %d is out of range\n", pwt->chroma_log2_weight_denom);
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pwt->chroma_log2_weight_denom = 0;
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}
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chroma_def = 1 << pwt->chroma_log2_weight_denom;
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}
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for (list = 0; list < 2; list++) {
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pwt->luma_weight_flag[list] = 0;
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pwt->chroma_weight_flag[list] = 0;
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for (i = 0; i < ref_count[list]; i++) {
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int luma_weight_flag, chroma_weight_flag;
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luma_weight_flag = get_bits1(gb);
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if (luma_weight_flag) {
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pwt->luma_weight[i][list][0] = get_se_golomb(gb);
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pwt->luma_weight[i][list][1] = get_se_golomb(gb);
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if ((int8_t)pwt->luma_weight[i][list][0] != pwt->luma_weight[i][list][0] ||
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(int8_t)pwt->luma_weight[i][list][1] != pwt->luma_weight[i][list][1])
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goto out_range_weight;
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if (pwt->luma_weight[i][list][0] != luma_def ||
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pwt->luma_weight[i][list][1] != 0) {
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pwt->use_weight = 1;
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pwt->luma_weight_flag[list] = 1;
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}
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} else {
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pwt->luma_weight[i][list][0] = luma_def;
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pwt->luma_weight[i][list][1] = 0;
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}
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if (sps->chroma_format_idc) {
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chroma_weight_flag = get_bits1(gb);
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if (chroma_weight_flag) {
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int j;
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for (j = 0; j < 2; j++) {
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pwt->chroma_weight[i][list][j][0] = get_se_golomb(gb);
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pwt->chroma_weight[i][list][j][1] = get_se_golomb(gb);
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if ((int8_t)pwt->chroma_weight[i][list][j][0] != pwt->chroma_weight[i][list][j][0] ||
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(int8_t)pwt->chroma_weight[i][list][j][1] != pwt->chroma_weight[i][list][j][1]) {
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pwt->chroma_weight[i][list][j][0] = chroma_def;
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pwt->chroma_weight[i][list][j][1] = 0;
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goto out_range_weight;
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}
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if (pwt->chroma_weight[i][list][j][0] != chroma_def ||
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pwt->chroma_weight[i][list][j][1] != 0) {
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pwt->use_weight_chroma = 1;
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pwt->chroma_weight_flag[list] = 1;
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}
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}
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} else {
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int j;
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for (j = 0; j < 2; j++) {
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pwt->chroma_weight[i][list][j][0] = chroma_def;
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pwt->chroma_weight[i][list][j][1] = 0;
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}
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}
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}
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// for MBAFF
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if (picture_structure == PICT_FRAME) {
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pwt->luma_weight[16 + 2 * i][list][0] = pwt->luma_weight[16 + 2 * i + 1][list][0] = pwt->luma_weight[i][list][0];
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pwt->luma_weight[16 + 2 * i][list][1] = pwt->luma_weight[16 + 2 * i + 1][list][1] = pwt->luma_weight[i][list][1];
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if (sps->chroma_format_idc) {
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for (j = 0; j < 2; j++) {
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pwt->chroma_weight[16 + 2 * i][list][j][0] = pwt->chroma_weight[16 + 2 * i + 1][list][j][0] = pwt->chroma_weight[i][list][j][0];
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pwt->chroma_weight[16 + 2 * i][list][j][1] = pwt->chroma_weight[16 + 2 * i + 1][list][j][1] = pwt->chroma_weight[i][list][j][1];
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}
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}
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}
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}
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if (slice_type_nos != AV_PICTURE_TYPE_B)
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break;
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}
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pwt->use_weight = pwt->use_weight || pwt->use_weight_chroma;
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return 0;
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out_range_weight:
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avpriv_request_sample(logctx, "Out of range weight");
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return AVERROR_INVALIDDATA;
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}
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/**
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* Check if the top & left blocks are available if needed and
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* change the dc mode so it only uses the available blocks.
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*/
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int ff_h264_check_intra4x4_pred_mode(int8_t *pred_mode_cache, void *logctx,
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int top_samples_available, int left_samples_available)
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{
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static const int8_t top[12] = {
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-1, 0, LEFT_DC_PRED, -1, -1, -1, -1, -1, 0
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};
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static const int8_t left[12] = {
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0, -1, TOP_DC_PRED, 0, -1, -1, -1, 0, -1, DC_128_PRED
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};
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int i;
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if (!(top_samples_available & 0x8000)) {
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for (i = 0; i < 4; i++) {
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int status = top[pred_mode_cache[scan8[0] + i]];
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if (status < 0) {
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av_log(logctx, AV_LOG_ERROR,
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"top block unavailable for requested intra mode %d\n",
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status);
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return AVERROR_INVALIDDATA;
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} else if (status) {
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pred_mode_cache[scan8[0] + i] = status;
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}
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}
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}
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if ((left_samples_available & 0x8888) != 0x8888) {
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static const int mask[4] = { 0x8000, 0x2000, 0x80, 0x20 };
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for (i = 0; i < 4; i++)
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if (!(left_samples_available & mask[i])) {
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int status = left[pred_mode_cache[scan8[0] + 8 * i]];
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if (status < 0) {
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av_log(logctx, AV_LOG_ERROR,
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"left block unavailable for requested intra4x4 mode %d\n",
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status);
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return AVERROR_INVALIDDATA;
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} else if (status) {
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pred_mode_cache[scan8[0] + 8 * i] = status;
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}
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}
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}
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return 0;
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}
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/**
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* Check if the top & left blocks are available if needed and
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* change the dc mode so it only uses the available blocks.
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*/
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int ff_h264_check_intra_pred_mode(void *logctx, int top_samples_available,
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int left_samples_available,
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int mode, int is_chroma)
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{
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static const int8_t top[4] = { LEFT_DC_PRED8x8, 1, -1, -1 };
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static const int8_t left[5] = { TOP_DC_PRED8x8, -1, 2, -1, DC_128_PRED8x8 };
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if (mode > 3U) {
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av_log(logctx, AV_LOG_ERROR,
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"out of range intra chroma pred mode\n");
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return AVERROR_INVALIDDATA;
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}
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if (!(top_samples_available & 0x8000)) {
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mode = top[mode];
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if (mode < 0) {
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av_log(logctx, AV_LOG_ERROR,
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"top block unavailable for requested intra mode\n");
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return AVERROR_INVALIDDATA;
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}
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}
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if ((left_samples_available & 0x8080) != 0x8080) {
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mode = left[mode];
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if (mode < 0) {
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av_log(logctx, AV_LOG_ERROR,
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"left block unavailable for requested intra mode\n");
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return AVERROR_INVALIDDATA;
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}
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if (is_chroma && (left_samples_available & 0x8080)) {
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// mad cow disease mode, aka MBAFF + constrained_intra_pred
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mode = ALZHEIMER_DC_L0T_PRED8x8 +
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(!(left_samples_available & 0x8000)) +
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2 * (mode == DC_128_PRED8x8);
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}
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}
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return mode;
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}
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int ff_h264_parse_ref_count(int *plist_count, int ref_count[2],
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GetBitContext *gb, const PPS *pps,
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int slice_type_nos, int picture_structure, void *logctx)
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{
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int list_count;
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int num_ref_idx_active_override_flag;
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// set defaults, might be overridden a few lines later
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ref_count[0] = pps->ref_count[0];
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ref_count[1] = pps->ref_count[1];
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if (slice_type_nos != AV_PICTURE_TYPE_I) {
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unsigned max[2];
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max[0] = max[1] = picture_structure == PICT_FRAME ? 15 : 31;
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num_ref_idx_active_override_flag = get_bits1(gb);
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if (num_ref_idx_active_override_flag) {
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ref_count[0] = get_ue_golomb(gb) + 1;
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if (slice_type_nos == AV_PICTURE_TYPE_B) {
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ref_count[1] = get_ue_golomb(gb) + 1;
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} else
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// full range is spec-ok in this case, even for frames
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ref_count[1] = 1;
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}
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if (slice_type_nos == AV_PICTURE_TYPE_B)
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list_count = 2;
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else
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list_count = 1;
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if (ref_count[0] - 1 > max[0] || (list_count == 2 && (ref_count[1] - 1 > max[1]))) {
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av_log(logctx, AV_LOG_ERROR, "reference overflow %u > %u or %u > %u\n",
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ref_count[0] - 1, max[0], ref_count[1] - 1, max[1]);
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ref_count[0] = ref_count[1] = 0;
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*plist_count = 0;
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goto fail;
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} else if (ref_count[1] - 1 > max[1]) {
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av_log(logctx, AV_LOG_DEBUG, "reference overflow %u > %u \n",
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ref_count[1] - 1, max[1]);
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ref_count[1] = 0;
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}
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} else {
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list_count = 0;
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ref_count[0] = ref_count[1] = 0;
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}
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*plist_count = list_count;
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return 0;
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fail:
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*plist_count = 0;
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ref_count[0] = 0;
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ref_count[1] = 0;
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return AVERROR_INVALIDDATA;
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}
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int ff_h264_init_poc(int pic_field_poc[2], int *pic_poc,
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const SPS *sps, H264POCContext *pc,
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int picture_structure, int nal_ref_idc)
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{
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const int max_frame_num = 1 << sps->log2_max_frame_num;
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int64_t field_poc[2];
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pc->frame_num_offset = pc->prev_frame_num_offset;
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if (pc->frame_num < pc->prev_frame_num)
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pc->frame_num_offset += max_frame_num;
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if (sps->poc_type == 0) {
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const int max_poc_lsb = 1 << sps->log2_max_poc_lsb;
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if (pc->prev_poc_lsb < 0)
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pc->prev_poc_lsb = pc->poc_lsb;
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if (pc->poc_lsb < pc->prev_poc_lsb &&
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pc->prev_poc_lsb - pc->poc_lsb >= max_poc_lsb / 2)
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pc->poc_msb = pc->prev_poc_msb + max_poc_lsb;
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else if (pc->poc_lsb > pc->prev_poc_lsb &&
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pc->prev_poc_lsb - pc->poc_lsb < -max_poc_lsb / 2)
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pc->poc_msb = pc->prev_poc_msb - max_poc_lsb;
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else
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pc->poc_msb = pc->prev_poc_msb;
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field_poc[0] =
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field_poc[1] = pc->poc_msb + pc->poc_lsb;
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if (picture_structure == PICT_FRAME)
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field_poc[1] += pc->delta_poc_bottom;
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} else if (sps->poc_type == 1) {
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int abs_frame_num;
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int64_t expected_delta_per_poc_cycle, expectedpoc;
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int i;
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if (sps->poc_cycle_length != 0)
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abs_frame_num = pc->frame_num_offset + pc->frame_num;
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else
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abs_frame_num = 0;
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if (nal_ref_idc == 0 && abs_frame_num > 0)
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abs_frame_num--;
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expected_delta_per_poc_cycle = 0;
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for (i = 0; i < sps->poc_cycle_length; i++)
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// FIXME integrate during sps parse
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expected_delta_per_poc_cycle += sps->offset_for_ref_frame[i];
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if (abs_frame_num > 0) {
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int poc_cycle_cnt = (abs_frame_num - 1) / sps->poc_cycle_length;
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int frame_num_in_poc_cycle = (abs_frame_num - 1) % sps->poc_cycle_length;
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expectedpoc = poc_cycle_cnt * expected_delta_per_poc_cycle;
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for (i = 0; i <= frame_num_in_poc_cycle; i++)
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expectedpoc = expectedpoc + sps->offset_for_ref_frame[i];
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} else
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expectedpoc = 0;
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if (nal_ref_idc == 0)
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expectedpoc = expectedpoc + sps->offset_for_non_ref_pic;
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field_poc[0] = expectedpoc + pc->delta_poc[0];
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field_poc[1] = field_poc[0] + sps->offset_for_top_to_bottom_field;
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if (picture_structure == PICT_FRAME)
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field_poc[1] += pc->delta_poc[1];
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} else {
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int poc = 2 * (pc->frame_num_offset + pc->frame_num);
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if (!nal_ref_idc)
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poc--;
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field_poc[0] = poc;
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field_poc[1] = poc;
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}
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if ( field_poc[0] != (int)field_poc[0]
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|| field_poc[1] != (int)field_poc[1])
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return AVERROR_INVALIDDATA;
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if (picture_structure != PICT_BOTTOM_FIELD)
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pic_field_poc[0] = field_poc[0];
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if (picture_structure != PICT_TOP_FIELD)
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pic_field_poc[1] = field_poc[1];
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*pic_poc = FFMIN(pic_field_poc[0], pic_field_poc[1]);
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return 0;
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}
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static int decode_extradata_ps(const uint8_t *data, int size, H264ParamSets *ps,
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int is_avc, void *logctx)
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{
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H2645Packet pkt = { 0 };
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int flags = (H2645_FLAG_IS_NALFF * !!is_avc) | H2645_FLAG_SMALL_PADDING;
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int i, ret = 0;
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ret = ff_h2645_packet_split(&pkt, data, size, logctx, 2, AV_CODEC_ID_H264, flags);
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if (ret < 0) {
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ret = 0;
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goto fail;
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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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switch (nal->type) {
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case H264_NAL_SPS: {
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GetBitContext tmp_gb = nal->gb;
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ret = ff_h264_decode_seq_parameter_set(&tmp_gb, logctx, ps, 0);
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if (ret >= 0)
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break;
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av_log(logctx, AV_LOG_DEBUG,
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"SPS decoding failure, trying again with the complete NAL\n");
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init_get_bits8(&tmp_gb, nal->raw_data + 1, nal->raw_size - 1);
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ret = ff_h264_decode_seq_parameter_set(&tmp_gb, logctx, ps, 0);
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if (ret >= 0)
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break;
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ret = ff_h264_decode_seq_parameter_set(&nal->gb, logctx, ps, 1);
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if (ret < 0)
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goto fail;
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break;
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}
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case H264_NAL_PPS:
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ret = ff_h264_decode_picture_parameter_set(&nal->gb, logctx, ps,
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nal->size_bits);
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if (ret < 0)
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goto fail;
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break;
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default:
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av_log(logctx, AV_LOG_VERBOSE, "Ignoring NAL type %d in extradata\n",
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nal->type);
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break;
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}
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}
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fail:
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ff_h2645_packet_uninit(&pkt);
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return ret;
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}
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/* There are (invalid) samples in the wild with mp4-style extradata, where the
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* parameter sets are stored unescaped (i.e. as RBSP).
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* This function catches the parameter set decoding failure and tries again
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* after escaping it */
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static int decode_extradata_ps_mp4(const uint8_t *buf, int buf_size, H264ParamSets *ps,
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int err_recognition, void *logctx)
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{
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int ret;
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ret = decode_extradata_ps(buf, buf_size, ps, 1, logctx);
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if (ret < 0 && !(err_recognition & AV_EF_EXPLODE)) {
|
|
GetByteContext gbc;
|
|
PutByteContext pbc;
|
|
uint8_t *escaped_buf;
|
|
int escaped_buf_size;
|
|
|
|
av_log(logctx, AV_LOG_WARNING,
|
|
"SPS decoding failure, trying again after escaping the NAL\n");
|
|
|
|
if (buf_size / 2 >= (INT16_MAX - AV_INPUT_BUFFER_PADDING_SIZE) / 3)
|
|
return AVERROR(ERANGE);
|
|
escaped_buf_size = buf_size * 3 / 2 + AV_INPUT_BUFFER_PADDING_SIZE;
|
|
escaped_buf = av_mallocz(escaped_buf_size);
|
|
if (!escaped_buf)
|
|
return AVERROR(ENOMEM);
|
|
|
|
bytestream2_init(&gbc, buf, buf_size);
|
|
bytestream2_init_writer(&pbc, escaped_buf, escaped_buf_size);
|
|
|
|
while (bytestream2_get_bytes_left(&gbc)) {
|
|
if (bytestream2_get_bytes_left(&gbc) >= 3 &&
|
|
bytestream2_peek_be24(&gbc) <= 3) {
|
|
bytestream2_put_be24(&pbc, 3);
|
|
bytestream2_skip(&gbc, 2);
|
|
} else
|
|
bytestream2_put_byte(&pbc, bytestream2_get_byte(&gbc));
|
|
}
|
|
|
|
escaped_buf_size = bytestream2_tell_p(&pbc);
|
|
AV_WB16(escaped_buf, escaped_buf_size - 2);
|
|
|
|
(void)decode_extradata_ps(escaped_buf, escaped_buf_size, ps, 1, logctx);
|
|
// lorex.mp4 decodes ok even with extradata decoding failing
|
|
av_freep(&escaped_buf);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int ff_h264_decode_extradata(const uint8_t *data, int size, H264ParamSets *ps,
|
|
int *is_avc, int *nal_length_size,
|
|
int err_recognition, void *logctx)
|
|
{
|
|
int ret;
|
|
|
|
if (!data || size <= 0)
|
|
return AVERROR(EINVAL);
|
|
|
|
if (data[0] == 1) {
|
|
int i, cnt, nalsize;
|
|
const uint8_t *p = data;
|
|
|
|
*is_avc = 1;
|
|
|
|
if (size < 7) {
|
|
av_log(logctx, AV_LOG_ERROR, "avcC %d too short\n", size);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
// Decode sps from avcC
|
|
cnt = *(p + 5) & 0x1f; // Number of sps
|
|
p += 6;
|
|
for (i = 0; i < cnt; i++) {
|
|
nalsize = AV_RB16(p) + 2;
|
|
if (nalsize > size - (p - data))
|
|
return AVERROR_INVALIDDATA;
|
|
ret = decode_extradata_ps_mp4(p, nalsize, ps, err_recognition, logctx);
|
|
if (ret < 0) {
|
|
av_log(logctx, AV_LOG_ERROR,
|
|
"Decoding sps %d from avcC failed\n", i);
|
|
return ret;
|
|
}
|
|
p += nalsize;
|
|
}
|
|
// Decode pps from avcC
|
|
cnt = *(p++); // Number of pps
|
|
for (i = 0; i < cnt; i++) {
|
|
nalsize = AV_RB16(p) + 2;
|
|
if (nalsize > size - (p - data))
|
|
return AVERROR_INVALIDDATA;
|
|
ret = decode_extradata_ps_mp4(p, nalsize, ps, err_recognition, logctx);
|
|
if (ret < 0) {
|
|
av_log(logctx, AV_LOG_ERROR,
|
|
"Decoding pps %d from avcC failed\n", i);
|
|
return ret;
|
|
}
|
|
p += nalsize;
|
|
}
|
|
// Store right nal length size that will be used to parse all other nals
|
|
*nal_length_size = (data[4] & 0x03) + 1;
|
|
} else {
|
|
*is_avc = 0;
|
|
ret = decode_extradata_ps(data, size, ps, 0, logctx);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
return size;
|
|
}
|
|
|
|
/**
|
|
* Compute profile from profile_idc and constraint_set?_flags.
|
|
*
|
|
* @param sps SPS
|
|
*
|
|
* @return profile as defined by AV_PROFILE_H264_*
|
|
*/
|
|
int ff_h264_get_profile(const SPS *sps)
|
|
{
|
|
int profile = sps->profile_idc;
|
|
|
|
switch (sps->profile_idc) {
|
|
case AV_PROFILE_H264_BASELINE:
|
|
// constraint_set1_flag set to 1
|
|
profile |= (sps->constraint_set_flags & 1 << 1) ? AV_PROFILE_H264_CONSTRAINED : 0;
|
|
break;
|
|
case AV_PROFILE_H264_HIGH_10:
|
|
case AV_PROFILE_H264_HIGH_422:
|
|
case AV_PROFILE_H264_HIGH_444_PREDICTIVE:
|
|
// constraint_set3_flag set to 1
|
|
profile |= (sps->constraint_set_flags & 1 << 3) ? AV_PROFILE_H264_INTRA : 0;
|
|
break;
|
|
}
|
|
|
|
return profile;
|
|
}
|