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author | Michael Niedermayer <michael@niedermayer.cc> | 2015-07-12 23:31:12 +0200 |
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committer | Michael Niedermayer <michael@niedermayer.cc> | 2015-07-12 23:44:24 +0200 |
commit | 4690a636324663be660602ea4d1d80ba4fa29763 (patch) | |
tree | e2e86aeda6938c596a5ac3362b59910787b6cd79 /libavcodec/hevc_parse.c | |
parent | 4c42c66935a7bdaded8667fa76dc0945ae66e867 (diff) | |
parent | d82e1adc2019135a2fc45372e0ed0b5ef107cdd0 (diff) |
Merge commit 'd82e1adc2019135a2fc45372e0ed0b5ef107cdd0'
* commit 'd82e1adc2019135a2fc45372e0ed0b5ef107cdd0':
hevc: move splitting the packet into NALUs into a separate function
Conflicts:
libavcodec/hevc.c
libavcodec/hevc.h
libavcodec/hevc_parse.c
Merged-by: Michael Niedermayer <michael@niedermayer.cc>
Diffstat (limited to 'libavcodec/hevc_parse.c')
-rw-r--r-- | libavcodec/hevc_parse.c | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/libavcodec/hevc_parse.c b/libavcodec/hevc_parse.c index 260f1e1aa6..ee9a9d9e96 100644 --- a/libavcodec/hevc_parse.c +++ b/libavcodec/hevc_parse.c @@ -143,3 +143,132 @@ nsc: return si; } +/** + * @return AVERROR_INVALIDDATA if the packet is not a valid NAL unit, + * 0 if the unit should be skipped, 1 otherwise + */ +static int hls_nal_unit(HEVCNAL *nal, AVCodecContext *avctx) +{ + GetBitContext *gb = &nal->gb; + int nuh_layer_id; + + if (get_bits1(gb) != 0) + return AVERROR_INVALIDDATA; + + nal->type = get_bits(gb, 6); + + nuh_layer_id = get_bits(gb, 6); + nal->temporal_id = get_bits(gb, 3) - 1; + if (nal->temporal_id < 0) + return AVERROR_INVALIDDATA; + + av_log(avctx, AV_LOG_DEBUG, + "nal_unit_type: %d, nuh_layer_id: %d, temporal_id: %d\n", + nal->type, nuh_layer_id, nal->temporal_id); + + return nuh_layer_id == 0; +} + + +int ff_hevc_split_packet(HEVCContext *s, HEVCPacket *pkt, const uint8_t *buf, int length, + AVCodecContext *avctx, int is_nalff, int nal_length_size) +{ + int consumed, ret = 0; + + pkt->nb_nals = 0; + while (length >= 4) { + HEVCNAL *nal; + int extract_length = 0; + + if (is_nalff) { + int i; + for (i = 0; i < nal_length_size; i++) + extract_length = (extract_length << 8) | buf[i]; + buf += nal_length_size; + length -= nal_length_size; + + if (extract_length > length) { + av_log(avctx, AV_LOG_ERROR, "Invalid NAL unit size.\n"); + return AVERROR_INVALIDDATA; + } + } else { + /* search start code */ + while (buf[0] != 0 || buf[1] != 0 || buf[2] != 1) { + ++buf; + --length; + if (length < 4) { + av_log(avctx, AV_LOG_ERROR, "No start code is found.\n"); + return AVERROR_INVALIDDATA; + } + } + + buf += 3; + length -= 3; + extract_length = length; + } + + if (pkt->nals_allocated < pkt->nb_nals + 1) { + int new_size = pkt->nals_allocated + 1; + void *tmp = av_realloc_array(pkt->nals, new_size, sizeof(*pkt->nals)); + + if (!tmp) + return AVERROR(ENOMEM); + + pkt->nals = tmp; + memset(pkt->nals + pkt->nals_allocated, 0, + (new_size - pkt->nals_allocated) * sizeof(*pkt->nals)); + + tmp = av_realloc_array(s->skipped_bytes_nal, new_size, sizeof(*s->skipped_bytes_nal)); + if (!tmp) + return AVERROR(ENOMEM); + s->skipped_bytes_nal = tmp; + + tmp = av_realloc_array(s->skipped_bytes_pos_size_nal, new_size, sizeof(*s->skipped_bytes_pos_size_nal)); + if (!tmp) + return AVERROR(ENOMEM); + s->skipped_bytes_pos_size_nal = tmp; + + tmp = av_realloc_array(s->skipped_bytes_pos_nal, new_size, sizeof(*s->skipped_bytes_pos_nal)); + if (!tmp) + return AVERROR(ENOMEM); + s->skipped_bytes_pos_nal = tmp; + + s->skipped_bytes_pos_size_nal[pkt->nals_allocated] = 1024; // initial buffer size + s->skipped_bytes_pos_nal[pkt->nals_allocated] = av_malloc_array(s->skipped_bytes_pos_size_nal[pkt->nals_allocated], sizeof(*s->skipped_bytes_pos)); + if (!s->skipped_bytes_pos_nal[pkt->nals_allocated]) + return AVERROR(ENOMEM); + + pkt->nals_allocated = new_size; + } + s->skipped_bytes_pos_size = s->skipped_bytes_pos_size_nal[pkt->nb_nals]; + s->skipped_bytes_pos = s->skipped_bytes_pos_nal[pkt->nb_nals]; + nal = &pkt->nals[pkt->nb_nals]; + + consumed = ff_hevc_extract_rbsp(s, buf, extract_length, nal); + if (consumed < 0) + return consumed; + + s->skipped_bytes_nal[pkt->nb_nals] = s->skipped_bytes; + s->skipped_bytes_pos_size_nal[pkt->nb_nals] = s->skipped_bytes_pos_size; + s->skipped_bytes_pos_nal[pkt->nb_nals++] = s->skipped_bytes_pos; + + ret = init_get_bits8(&nal->gb, nal->data, nal->size); + if (ret < 0) + return ret; + + ret = hls_nal_unit(nal, avctx); + if (ret <= 0) { + if (ret < 0) { + av_log(avctx, AV_LOG_ERROR, "Invalid NAL unit %d, skipping.\n", + nal->type); + } + pkt->nb_nals--; + } + + buf += consumed; + length -= consumed; + } + + return 0; +} + |