/* * 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 "get_bits.h" #include "golomb.h" #include "h264.h" #include "h264dec.h" #include "h264_parse.h" #include "h264_ps.h" int ff_h264_pred_weight_table(GetBitContext *gb, const SPS *sps, const int *ref_count, int slice_type_nos, H264PredWeightTable *pwt, int picture_structure, void *logctx) { int list, i, j; int luma_def, chroma_def; pwt->use_weight = 0; pwt->use_weight_chroma = 0; pwt->luma_log2_weight_denom = get_ue_golomb(gb); if (pwt->luma_log2_weight_denom > 7U) { av_log(logctx, AV_LOG_ERROR, "luma_log2_weight_denom %d is out of range\n", pwt->luma_log2_weight_denom); pwt->luma_log2_weight_denom = 0; } luma_def = 1 << pwt->luma_log2_weight_denom; if (sps->chroma_format_idc) { pwt->chroma_log2_weight_denom = get_ue_golomb(gb); if (pwt->chroma_log2_weight_denom > 7U) { av_log(logctx, AV_LOG_ERROR, "chroma_log2_weight_denom %d is out of range\n", pwt->chroma_log2_weight_denom); pwt->chroma_log2_weight_denom = 0; } chroma_def = 1 << pwt->chroma_log2_weight_denom; } for (list = 0; list < 2; list++) { pwt->luma_weight_flag[list] = 0; pwt->chroma_weight_flag[list] = 0; for (i = 0; i < ref_count[list]; i++) { int luma_weight_flag, chroma_weight_flag; luma_weight_flag = get_bits1(gb); if (luma_weight_flag) { pwt->luma_weight[i][list][0] = get_se_golomb(gb); pwt->luma_weight[i][list][1] = get_se_golomb(gb); if ((int8_t)pwt->luma_weight[i][list][0] != pwt->luma_weight[i][list][0] || (int8_t)pwt->luma_weight[i][list][1] != pwt->luma_weight[i][list][1]) goto out_range_weight; if (pwt->luma_weight[i][list][0] != luma_def || pwt->luma_weight[i][list][1] != 0) { pwt->use_weight = 1; pwt->luma_weight_flag[list] = 1; } } else { pwt->luma_weight[i][list][0] = luma_def; pwt->luma_weight[i][list][1] = 0; } if (sps->chroma_format_idc) { chroma_weight_flag = get_bits1(gb); if (chroma_weight_flag) { int j; for (j = 0; j < 2; j++) { pwt->chroma_weight[i][list][j][0] = get_se_golomb(gb); pwt->chroma_weight[i][list][j][1] = get_se_golomb(gb); if ((int8_t)pwt->chroma_weight[i][list][j][0] != pwt->chroma_weight[i][list][j][0] || (int8_t)pwt->chroma_weight[i][list][j][1] != pwt->chroma_weight[i][list][j][1]) { pwt->chroma_weight[i][list][j][0] = chroma_def; pwt->chroma_weight[i][list][j][1] = 0; goto out_range_weight; } if (pwt->chroma_weight[i][list][j][0] != chroma_def || pwt->chroma_weight[i][list][j][1] != 0) { pwt->use_weight_chroma = 1; pwt->chroma_weight_flag[list] = 1; } } } else { int j; for (j = 0; j < 2; j++) { pwt->chroma_weight[i][list][j][0] = chroma_def; pwt->chroma_weight[i][list][j][1] = 0; } } } // for MBAFF if (picture_structure == PICT_FRAME) { pwt->luma_weight[16 + 2 * i][list][0] = pwt->luma_weight[16 + 2 * i + 1][list][0] = pwt->luma_weight[i][list][0]; pwt->luma_weight[16 + 2 * i][list][1] = pwt->luma_weight[16 + 2 * i + 1][list][1] = pwt->luma_weight[i][list][1]; if (sps->chroma_format_idc) { for (j = 0; j < 2; j++) { 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]; 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]; } } } } if (slice_type_nos != AV_PICTURE_TYPE_B) break; } pwt->use_weight = pwt->use_weight || pwt->use_weight_chroma; return 0; out_range_weight: avpriv_request_sample(logctx, "Out of range weight"); return AVERROR_INVALIDDATA; } /** * Check if the top & left blocks are available if needed and * change the dc mode so it only uses the available blocks. */ int ff_h264_check_intra4x4_pred_mode(int8_t *pred_mode_cache, void *logctx, int top_samples_available, int left_samples_available) { static const int8_t top[12] = { -1, 0, LEFT_DC_PRED, -1, -1, -1, -1, -1, 0 }; static const int8_t left[12] = { 0, -1, TOP_DC_PRED, 0, -1, -1, -1, 0, -1, DC_128_PRED }; int i; if (!(top_samples_available & 0x8000)) { for (i = 0; i < 4; i++) { int status = top[pred_mode_cache[scan8[0] + i]]; if (status < 0) { av_log(logctx, AV_LOG_ERROR, "top block unavailable for requested intra mode %d\n", status); return AVERROR_INVALIDDATA; } else if (status) { pred_mode_cache[scan8[0] + i] = status; } } } if ((left_samples_available & 0x8888) != 0x8888) { static const int mask[4] = { 0x8000, 0x2000, 0x80, 0x20 }; for (i = 0; i < 4; i++) if (!(left_samples_available & mask[i])) { int status = left[pred_mode_cache[scan8[0] + 8 * i]]; if (status < 0) { av_log(logctx, AV_LOG_ERROR, "left block unavailable for requested intra4x4 mode %d\n", status); return AVERROR_INVALIDDATA; } else if (status) { pred_mode_cache[scan8[0] + 8 * i] = status; } } } return 0; } /** * Check if the top & left blocks are available if needed and * change the dc mode so it only uses the available blocks. */ int ff_h264_check_intra_pred_mode(void *logctx, int top_samples_available, int left_samples_available, int mode, int is_chroma) { static const int8_t top[4] = { LEFT_DC_PRED8x8, 1, -1, -1 }; static const int8_t left[5] = { TOP_DC_PRED8x8, -1, 2, -1, DC_128_PRED8x8 }; if (mode > 3U) { av_log(logctx, AV_LOG_ERROR, "out of range intra chroma pred mode\n"); return AVERROR_INVALIDDATA; } if (!(top_samples_available & 0x8000)) { mode = top[mode]; if (mode < 0) { av_log(logctx, AV_LOG_ERROR, "top block unavailable for requested intra mode\n"); return AVERROR_INVALIDDATA; } } if ((left_samples_available & 0x8080) != 0x8080) { mode = left[mode]; if (mode < 0) { av_log(logctx, AV_LOG_ERROR, "left block unavailable for requested intra mode\n"); return AVERROR_INVALIDDATA; } if (is_chroma && (left_samples_available & 0x8080)) { // mad cow disease mode, aka MBAFF + constrained_intra_pred mode = ALZHEIMER_DC_L0T_PRED8x8 + (!(left_samples_available & 0x8000)) + 2 * (mode == DC_128_PRED8x8); } } return mode; } int ff_h264_parse_ref_count(int *plist_count, int ref_count[2], GetBitContext *gb, const PPS *pps, int slice_type_nos, int picture_structure, void *logctx) { int list_count; int num_ref_idx_active_override_flag; // set defaults, might be overridden a few lines later ref_count[0] = pps->ref_count[0]; ref_count[1] = pps->ref_count[1]; if (slice_type_nos != AV_PICTURE_TYPE_I) { unsigned max[2]; max[0] = max[1] = picture_structure == PICT_FRAME ? 15 : 31; num_ref_idx_active_override_flag = get_bits1(gb); if (num_ref_idx_active_override_flag) { ref_count[0] = get_ue_golomb(gb) + 1; if (slice_type_nos == AV_PICTURE_TYPE_B) { ref_count[1] = get_ue_golomb(gb) + 1; } else // full range is spec-ok in this case, even for frames ref_count[1] = 1; } if (ref_count[0] - 1 > max[0] || ref_count[1] - 1 > max[1]) { av_log(logctx, AV_LOG_ERROR, "reference overflow %u > %u or %u > %u\n", ref_count[0] - 1, max[0], ref_count[1] - 1, max[1]); ref_count[0] = ref_count[1] = 0; *plist_count = 0; goto fail; } if (slice_type_nos == AV_PICTURE_TYPE_B) list_count = 2; else list_count = 1; } else { list_count = 0; ref_count[0] = ref_count[1] = 0; } *plist_count = list_count; return 0; fail: *plist_count = 0; ref_count[0] = 0; ref_count[1] = 0; return AVERROR_INVALIDDATA; } int ff_h264_init_poc(int pic_field_poc[2], int *pic_poc, const SPS *sps, H264POCContext *pc, int picture_structure, int nal_ref_idc) { const int max_frame_num = 1 << sps->log2_max_frame_num; int64_t field_poc[2]; pc->frame_num_offset = pc->prev_frame_num_offset; if (pc->frame_num < pc->prev_frame_num) pc->frame_num_offset += max_frame_num; if (sps->poc_type == 0) { const int max_poc_lsb = 1 << sps->log2_max_poc_lsb; if (pc->poc_lsb < pc->prev_poc_lsb && pc->prev_poc_lsb - pc->poc_lsb >= max_poc_lsb / 2) pc->poc_msb = pc->prev_poc_msb + max_poc_lsb; else if (pc->poc_lsb > pc->prev_poc_lsb && pc->prev_poc_lsb - pc->poc_lsb < -max_poc_lsb / 2) pc->poc_msb = pc->prev_poc_msb - max_poc_lsb; else pc->poc_msb = pc->prev_poc_msb; field_poc[0] = field_poc[1] = pc->poc_msb + pc->poc_lsb; if (picture_structure == PICT_FRAME) field_poc[1] += pc->delta_poc_bottom; } else if (sps->poc_type == 1) { int abs_frame_num, expected_delta_per_poc_cycle, expectedpoc; int i; if (sps->poc_cycle_length != 0) abs_frame_num = pc->frame_num_offset + pc->frame_num; else abs_frame_num = 0; if (nal_ref_idc == 0 && abs_frame_num > 0) abs_frame_num--; expected_delta_per_poc_cycle = 0; for (i = 0; i < sps->poc_cycle_length; i++) // FIXME integrate during sps parse expected_delta_per_poc_cycle += sps->offset_for_ref_frame[i]; if (abs_frame_num > 0) { int poc_cycle_cnt = (abs_frame_num - 1) / sps->poc_cycle_length; int frame_num_in_poc_cycle = (abs_frame_num - 1) % sps->poc_cycle_length; expectedpoc = poc_cycle_cnt * expected_delta_per_poc_cycle; for (i = 0; i <= frame_num_in_poc_cycle; i++) expectedpoc = expectedpoc + sps->offset_for_ref_frame[i]; } else expectedpoc = 0; if (nal_ref_idc == 0) expectedpoc = expectedpoc + sps->offset_for_non_ref_pic; field_poc[0] = expectedpoc + pc->delta_poc[0]; field_poc[1] = field_poc[0] + sps->offset_for_top_to_bottom_field; if (picture_structure == PICT_FRAME) field_poc[1] += pc->delta_poc[1]; } else { int poc = 2 * (pc->frame_num_offset + pc->frame_num); if (!nal_ref_idc) poc--; field_poc[0] = poc; field_poc[1] = poc; } if ( field_poc[0] != (int)field_poc[0] || field_poc[1] != (int)field_poc[1]) return AVERROR_INVALIDDATA; if (picture_structure != PICT_BOTTOM_FIELD) pic_field_poc[0] = field_poc[0]; if (picture_structure != PICT_TOP_FIELD) pic_field_poc[1] = field_poc[1]; *pic_poc = FFMIN(pic_field_poc[0], pic_field_poc[1]); return 0; } static int decode_extradata_ps(const uint8_t *data, int size, H264ParamSets *ps, int is_avc, void *logctx) { H2645Packet pkt = { 0 }; int i, ret = 0; ret = ff_h2645_packet_split(&pkt, data, size, logctx, is_avc, 2, AV_CODEC_ID_H264, 1, 0); if (ret < 0) { ret = 0; goto fail; } for (i = 0; i < pkt.nb_nals; i++) { H2645NAL *nal = &pkt.nals[i]; switch (nal->type) { case H264_NAL_SPS: ret = ff_h264_decode_seq_parameter_set(&nal->gb, logctx, ps, 0); if (ret < 0) goto fail; break; case H264_NAL_PPS: ret = ff_h264_decode_picture_parameter_set(&nal->gb, logctx, ps, nal->size_bits); if (ret < 0) goto fail; break; default: av_log(logctx, AV_LOG_VERBOSE, "Ignoring NAL type %d in extradata\n", nal->type); break; } } fail: ff_h2645_packet_uninit(&pkt); return ret; } /* There are (invalid) samples in the wild with mp4-style extradata, where the * parameter sets are stored unescaped (i.e. as RBSP). * This function catches the parameter set decoding failure and tries again * after escaping it */ static int decode_extradata_ps_mp4(const uint8_t *buf, int buf_size, H264ParamSets *ps, int err_recognition, void *logctx) { int ret; ret = decode_extradata_ps(buf, buf_size, ps, 1, logctx); 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 -1; 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 FF_PROFILE_H264_* */ int ff_h264_get_profile(const SPS *sps) { int profile = sps->profile_idc; switch (sps->profile_idc) { case FF_PROFILE_H264_BASELINE: // constraint_set1_flag set to 1 profile |= (sps->constraint_set_flags & 1 << 1) ? FF_PROFILE_H264_CONSTRAINED : 0; break; case FF_PROFILE_H264_HIGH_10: case FF_PROFILE_H264_HIGH_422: case FF_PROFILE_H264_HIGH_444_PREDICTIVE: // constraint_set3_flag set to 1 profile |= (sps->constraint_set_flags & 1 << 3) ? FF_PROFILE_H264_INTRA : 0; break; } return profile; }