[FFmpeg-devel] [PATCH v7 3/5] lavc/avs3_parser: add avs3 parser
hwrenx at 126.com
hwrenx at 126.com
Mon Aug 24 06:02:39 EEST 2020
From: hwren <hwrenx at 126.com>
Signed-off-by: hbj <hanbj at pku.edu.cn>
Signed-off-by: hwren <hwrenx at 126.com>
---
libavcodec/Makefile | 1 +
libavcodec/avs3_parser.c | 180 +++++++++++++++++++++++++++++++++++++++
libavcodec/parsers.c | 1 +
3 files changed, 182 insertions(+)
create mode 100644 libavcodec/avs3_parser.c
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index e1e0c4629d..4c596515ee 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -1061,6 +1061,7 @@ OBJS-$(CONFIG_AC3_PARSER) += ac3tab.o aac_ac3_parser.o
OBJS-$(CONFIG_ADX_PARSER) += adx_parser.o adx.o
OBJS-$(CONFIG_AV1_PARSER) += av1_parser.o av1_parse.o
OBJS-$(CONFIG_AVS2_PARSER) += avs2_parser.o
+OBJS-$(CONFIG_AVS3_PARSER) += avs3_parser.o
OBJS-$(CONFIG_BMP_PARSER) += bmp_parser.o
OBJS-$(CONFIG_CAVSVIDEO_PARSER) += cavs_parser.o
OBJS-$(CONFIG_COOK_PARSER) += cook_parser.o
diff --git a/libavcodec/avs3_parser.c b/libavcodec/avs3_parser.c
new file mode 100644
index 0000000000..36ca19797d
--- /dev/null
+++ b/libavcodec/avs3_parser.c
@@ -0,0 +1,180 @@
+/*
+ * AVS3-P2/IEEE1857.10 video parser.
+ * Copyright (c) 2020 Zhenyu Wang <wangzhenyu at pkusz.edu.cn>
+ * Bingjie Han <hanbj at pkusz.edu.cn>
+ * Huiwen Ren <hwrenx at gmail.com>
+ *
+ * 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 "avs3.h"
+#include "get_bits.h"
+#include "parser.h"
+
+static int avs3_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
+{
+ int pic_found = pc->frame_start_found;
+ uint32_t state = pc->state;
+ int cur = 0;
+
+ if (!pic_found) {
+ for (; cur < buf_size; ++cur) {
+ state = (state << 8) | buf[cur];
+ if (ISPIC(buf[cur])){
+ ++cur;
+ pic_found = 1;
+ break;
+ }
+ }
+ }
+
+ if (pic_found) {
+ if (!buf_size)
+ return END_NOT_FOUND;
+ for (; cur < buf_size; ++cur) {
+ state = (state << 8) | buf[cur];
+ if ((state & 0xFFFFFF00) == 0x100 && ISUNIT(state & 0xFF)) {
+ pc->frame_start_found = 0;
+ pc->state = -1;
+ return cur - 3;
+ }
+ }
+ }
+
+ pc->frame_start_found = pic_found;
+ pc->state = state;
+
+ return END_NOT_FOUND;
+}
+
+static void parse_avs3_nal_units(AVCodecParserContext *s, const uint8_t *buf,
+ int buf_size, AVCodecContext *avctx)
+{
+ if (buf_size < 5) {
+ return;
+ }
+
+ if (buf[0] == 0x0 && buf[1] == 0x0 && buf[2] == 0x1) {
+ if (buf[3] == AVS3_SEQ_START_CODE) {
+ GetBitContext gb;
+ int profile, ratecode;
+
+ init_get_bits(&gb, buf + 4, buf_size - 4);
+
+ s->key_frame = 1;
+ s->pict_type = AV_PICTURE_TYPE_I;
+
+ profile = get_bits(&gb, 8);
+ // Skip bits: level(8)
+ // progressive(1)
+ // field(1)
+ // library(2)
+ // resv(1)
+ // width(14)
+ // resv(1)
+ // height(14)
+ // chroma(2)
+ // sampe_precision(3)
+ skip_bits(&gb, 47);
+
+ if (profile == AVS3_PROFILE_BASELINE_MAIN10) {
+ int sample_precision = get_bits(&gb, 3);
+ if (sample_precision == 1) {
+ avctx->pix_fmt = AV_PIX_FMT_YUV420P;
+ } else if (sample_precision == 2) {
+ avctx->pix_fmt = AV_PIX_FMT_YUV420P10LE;
+ } else {
+ avctx->pix_fmt = AV_PIX_FMT_NONE;
+ }
+ }
+
+ // Skip bits: resv(1)
+ // aspect(4)
+ skip_bits(&gb, 5);
+
+ ratecode = get_bits(&gb, 4);
+
+ // Skip bits: resv(1)
+ // bitrate_low(18)
+ // resv(1)
+ // bitrate_high(12)
+ // low_delay
+ skip_bits(&gb, 32);
+
+ avctx->has_b_frames = !get_bits(&gb, 1);
+
+ avctx->framerate.num = avctx->time_base.den = ff_avs3_frame_rate_tab[ratecode].num;
+ avctx->framerate.den = avctx->time_base.num = ff_avs3_frame_rate_tab[ratecode].den;
+
+ s->width = s->coded_width = avctx->width;
+ s->height = s->coded_height = avctx->height;
+
+ av_log(avctx, AV_LOG_DEBUG,
+ "avs3 parse seq hdr: profile %d; coded wxh: %dx%d; "
+ "frame_rate_code %d\n", profile, avctx->width, avctx->height, ratecode);
+
+ } else if (buf[3] == AVS3_INTRA_PIC_START_CODE) {
+ s->key_frame = 1;
+ s->pict_type = AV_PICTURE_TYPE_I;
+ } else if (buf[3] == AVS3_INTER_PIC_START_CODE){
+ s->key_frame = 0;
+ if (buf_size > 9) {
+ int pic_code_type = buf[8] & 0x3;
+ if (pic_code_type == 1 || pic_code_type == 3) {
+ s->pict_type = AV_PICTURE_TYPE_P;
+ } else {
+ s->pict_type = AV_PICTURE_TYPE_B;
+ }
+ }
+ }
+ }
+}
+
+
+static int avs3_parse(AVCodecParserContext *s, AVCodecContext *avctx,
+ const uint8_t **poutbuf, int *poutbuf_size,
+ const uint8_t *buf, int buf_size)
+{
+ ParseContext *pc = s->priv_data;
+ int next;
+
+ if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
+ next = buf_size;
+ } else {
+ next = avs3_find_frame_end(pc, buf, buf_size);
+ if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
+ *poutbuf = NULL;
+ *poutbuf_size = 0;
+ return buf_size;
+ }
+ }
+
+ parse_avs3_nal_units(s, buf, buf_size, avctx);
+
+ *poutbuf = buf;
+ *poutbuf_size = buf_size;
+
+ return next;
+}
+
+AVCodecParser ff_avs3_parser = {
+ .codec_ids = { AV_CODEC_ID_AVS3 },
+ .priv_data_size = sizeof(ParseContext),
+ .parser_parse = avs3_parse,
+ .parser_close = ff_parse_close,
+ .split = ff_mpeg4video_split,
+};
diff --git a/libavcodec/parsers.c b/libavcodec/parsers.c
index 7d75cea830..aab1d5e3e5 100644
--- a/libavcodec/parsers.c
+++ b/libavcodec/parsers.c
@@ -28,6 +28,7 @@ extern AVCodecParser ff_ac3_parser;
extern AVCodecParser ff_adx_parser;
extern AVCodecParser ff_av1_parser;
extern AVCodecParser ff_avs2_parser;
+extern AVCodecParser ff_avs3_parser;
extern AVCodecParser ff_bmp_parser;
extern AVCodecParser ff_cavsvideo_parser;
extern AVCodecParser ff_cook_parser;
--
2.23.0.windows.1
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