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Mon, 15 Jun 2020 07:27:21 -0700 (PDT) Received: from vpn2.localdomain ([161.117.202.209]) by smtp.gmail.com with ESMTPSA id u61sm13437547pjb.7.2020.06.15.07.27.19 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 15 Jun 2020 07:27:20 -0700 (PDT) From: lance.lmwang@gmail.com To: ffmpeg-devel@ffmpeg.org Date: Mon, 15 Jun 2020 22:27:13 +0800 Message-Id: <1592231234-6049-1-git-send-email-lance.lmwang@gmail.com> X-Mailer: git-send-email 1.8.3.1 Subject: [FFmpeg-devel] [PATCH 1/2] avcodec/hevc_sei: support HEVC timecode decode X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: FFmpeg development discussions and patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: FFmpeg development discussions and patches Cc: Limin Wang MIME-Version: 1.0 Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" From: Limin Wang Signed-off-by: Limin Wang --- libavcodec/hevc_sei.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++ libavcodec/hevc_sei.h | 21 +++++++++++++++++++++ 2 files changed, 70 insertions(+) diff --git a/libavcodec/hevc_sei.c b/libavcodec/hevc_sei.c index 1736891..6d484b5 100644 --- a/libavcodec/hevc_sei.c +++ b/libavcodec/hevc_sei.c @@ -306,6 +306,53 @@ static int decode_nal_sei_alternative_transfer(HEVCSEIAlternativeTransfer *s, Ge return 0; } +static int decode_nal_sei_timecode(HEVCSEITimeCode *s, GetBitContext *gb) +{ + s->num_clock_ts = get_bits(gb, 2) & 3; + + for (int i = 0; i < s->num_clock_ts; i++) { + s->clock_timestamp_flag[i] = get_bits(gb, 1); + + if (s->clock_timestamp_flag[i]) { + s->units_field_based_flag[i] = get_bits(gb, 1); + s->counting_type[i] = get_bits(gb, 5); + s->full_timestamp_flag[i] = get_bits(gb, 1); + s->discontinuity_flag[i] = get_bits(gb, 1); + s->cnt_dropped_flag[i] = get_bits(gb, 1); + + s->n_frames[i] = get_bits(gb, 9); + + if (s->full_timestamp_flag[i]) { + s->seconds_value[i] = av_clip(get_bits(gb, 6), 0, 59); + s->minutes_value[i] = av_clip(get_bits(gb, 6), 0, 59); + s->hours_value[i] = av_clip(get_bits(gb, 6), 0, 59); + } else { + s->seconds_flag[i] = get_bits(gb, 1); + if (s->seconds_flag[i]) { + s->seconds_value[i] = av_clip(get_bits(gb, 6), 0, 59); + s->minutes_flag[i] = get_bits(gb, 1); + if (s->minutes_flag[i]) { + s->minutes_value[i] = av_clip(get_bits(gb, 6), 0, 59); + s->hours_flag[i] = get_bits(gb, 1); + if (s->hours_flag[i]) { + s->hours_value[i] = av_clip(get_bits(gb, 6), 0, 59); + } + } + } + } + + s->time_offset_length[i] = get_bits(gb, 5); + if (s->time_offset_length[i] > 0) { + s->time_offset_value[i] = get_bits(gb, s->time_offset_length[i]); + } + } + } + + s->present = 1; + return 0; +} + + static int decode_nal_sei_prefix(GetBitContext *gb, void *logctx, HEVCSEI *s, const HEVCParamSets *ps, int type, int size) { @@ -330,6 +377,8 @@ static int decode_nal_sei_prefix(GetBitContext *gb, void *logctx, HEVCSEI *s, return decode_nal_sei_user_data_unregistered(&s->unregistered, gb, size); case HEVC_SEI_TYPE_ALTERNATIVE_TRANSFER_CHARACTERISTICS: return decode_nal_sei_alternative_transfer(&s->alternative_transfer, gb); + case HEVC_SEI_TYPE_TIME_CODE: + return decode_nal_sei_timecode(&s->timecode, gb); default: av_log(logctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", type); skip_bits_long(gb, 8 * size); diff --git a/libavcodec/hevc_sei.h b/libavcodec/hevc_sei.h index 3618d16..5ee7a47 100644 --- a/libavcodec/hevc_sei.h +++ b/libavcodec/hevc_sei.h @@ -115,6 +115,26 @@ typedef struct HEVCSEIAlternativeTransfer { int preferred_transfer_characteristics; } HEVCSEIAlternativeTransfer; +typedef struct HEVCSEITimeCode { + int present; + uint8_t num_clock_ts; + uint8_t clock_timestamp_flag[3]; + uint8_t units_field_based_flag[3]; + uint8_t counting_type[3]; + uint8_t full_timestamp_flag[3]; + uint8_t discontinuity_flag[3]; + uint8_t cnt_dropped_flag[3]; + uint16_t n_frames[3]; + uint8_t seconds_value[3]; + uint8_t minutes_value[3]; + uint8_t hours_value[3]; + uint8_t seconds_flag[3]; + uint8_t minutes_flag[3]; + uint8_t hours_flag[3]; + uint8_t time_offset_length[3]; + int32_t time_offset_value[3]; +} HEVCSEITimeCode; + typedef struct HEVCSEI { HEVCSEIPictureHash picture_hash; HEVCSEIFramePacking frame_packing; @@ -126,6 +146,7 @@ typedef struct HEVCSEI { HEVCSEIContentLight content_light; int active_seq_parameter_set_id; HEVCSEIAlternativeTransfer alternative_transfer; + HEVCSEITimeCode timecode; } HEVCSEI; struct HEVCParamSets;