On Wed, Jul 26, 2023 at 11:27 AM hung kuishing <hungkuish...@outlook.com>
wrote:
> Signed-off-by: clarkh <hungkuish...@outlook.com>
> ---
> libavcodec/Makefile | 1 +
> libavcodec/parsers.c | 1 +
> libavcodec/prores_parser.c | 107 +++++++++++++++++++++++++++++++++++++
> 3 files changed, 109 insertions(+)
> create mode 100644 libavcodec/prores_parser.c
>
What is usage for this?
Which streams/files need this?
Have parser be tested rigorously with random noise data?
>
> diff --git a/libavcodec/Makefile b/libavcodec/Makefile
> index 1b0226c089..21cd28c9ac 100644
> --- a/libavcodec/Makefile
> +++ b/libavcodec/Makefile
> @@ -1198,6 +1198,7 @@ OBJS-$(CONFIG_OPUS_PARSER) +=
> opus_parser.o opus_parse.o \
> vorbis_data.o
> OBJS-$(CONFIG_PNG_PARSER) += png_parser.o
> OBJS-$(CONFIG_PNM_PARSER) += pnm_parser.o pnm.o
> +OBJS-$(CONFIG_PRORES_PARSER) += prores_parser.o
> OBJS-$(CONFIG_QOI_PARSER) += qoi_parser.o
> OBJS-$(CONFIG_RV30_PARSER) += rv34_parser.o
> OBJS-$(CONFIG_RV40_PARSER) += rv34_parser.o
> diff --git a/libavcodec/parsers.c b/libavcodec/parsers.c
> index 285f81a901..131867686a 100644
> --- a/libavcodec/parsers.c
> +++ b/libavcodec/parsers.c
> @@ -64,6 +64,7 @@ extern const AVCodecParser ff_mpegvideo_parser;
> extern const AVCodecParser ff_opus_parser;
> extern const AVCodecParser ff_png_parser;
> extern const AVCodecParser ff_pnm_parser;
> +extern const AVCodecParser ff_prores_parser;
> extern const AVCodecParser ff_qoi_parser;
> extern const AVCodecParser ff_rv30_parser;
> extern const AVCodecParser ff_rv40_parser;
> diff --git a/libavcodec/prores_parser.c b/libavcodec/prores_parser.c
> new file mode 100644
> index 0000000000..1299c7b642
> --- /dev/null
> +++ b/libavcodec/prores_parser.c
> @@ -0,0 +1,107 @@
> +/*
> + * ProRes bitstream parser
> + * Copyright (c) 2023 clarkh <hungkuish...@outlook.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 "parser.h"
> +#include "libavutil/intreadwrite.h"
> +#include "libavcodec/proresdata.h"
> +
> +typedef struct {
> + ParseContext pc;
> + int remaining;
> + int overwrite;
> +} ProResParserContext;
> +
> +static int prores_find_frame_end(ProResParserContext *pctx, const uint8_t
> *buf, int buf_size)
> +{
> + ParseContext *pc = &pctx->pc;
> + uint64_t state64 = pc->state64;
> + int pic_found = pc->frame_start_found;
> + int i = 0;
> +
> + if (!pic_found) {
> + for (i = 0; i < buf_size; i++) {
> + state64 = (state64 << 8) | buf[i];
> + if ((state64 & 0xFFFFFFFF) == FRAME_ID) {
> + i++;
> + pic_found = 1;
> + pctx->remaining = state64 >> 32;
> + pctx->remaining -= pctx->overwrite;
> + break;
> + }
> + }
> + }
> +
> + if (pic_found) {
> + if (!buf_size)
> + return END_NOT_FOUND;
> +
> + if (pctx->remaining > buf_size) {
> + pctx->remaining -= buf_size;
> + } else {
> + int remaining = pctx->remaining;
> +
> + pc->frame_start_found = 0;
> + pc->state64 = -1;
> + pctx->remaining = 0;
> + pctx->overwrite = 0;
> + return remaining;
> + }
> + } else {
> + pctx->overwrite += buf_size;
> + }
> +
> + pc->frame_start_found = pic_found;
> + pc->state64 = state64;
> +
> + return END_NOT_FOUND;
> +}
> +
> +static int prores_parse(AVCodecParserContext *s, AVCodecContext *avctx,
> + const uint8_t **poutbuf, int *poutbuf_size,
> + const uint8_t *buf, int buf_size)
> +{
> + ProResParserContext *pctx = s->priv_data;
> + ParseContext *pc = &pctx->pc;
> + int next;
> +
> + if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
> + next = buf_size;
> + } else {
> + next = prores_find_frame_end(pctx, buf, buf_size);
> + if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
> + *poutbuf = NULL;
> + *poutbuf_size = 0;
> + return buf_size;
> + }
> + }
> +
> + *poutbuf = buf;
> + *poutbuf_size = buf_size;
> +
> + return next;
> +}
> +
> +const AVCodecParser ff_prores_parser = {
> + .codec_ids = { AV_CODEC_ID_PRORES },
> + .priv_data_size = sizeof(ProResParserContext),
> + .parser_parse = prores_parse,
> + .parser_close = ff_parse_close
> +};
> --
> 2.34.1
>
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