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charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" Archived-At: List-Archive: List-Post: Signed-off-by: clarkh --- libavcodec/Makefile | 1 + libavcodec/parsers.c | 1 + libavcodec/prores_parser.c | 107 +++++++++++++++++++++++++++++++++++++ 3 files changed, 109 insertions(+) create mode 100644 libavcodec/prores_parser.c 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 + * + * 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 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".