On 01/02/2025 15:48, James Almer wrote:
Only setting key frames.Signed-off-by: James Almer <jamr...@gmail.com> --- configure | 1 + libavcodec/Makefile | 1 + libavcodec/ffv1_parser.c | 45 ++++++++++++++++++++++++++++++++++++++++ libavcodec/parsers.c | 1 + 4 files changed, 48 insertions(+) create mode 100644 libavcodec/ffv1_parser.c diff --git a/configure b/configure index 06f641ead0..f09faaf505 100755 --- a/configure +++ b/configure @@ -3469,6 +3469,7 @@ vvc_qsv_decoder_select="vvc_mp4toannexb_bsf qsvdec" aac_parser_select="adts_header mpeg4audio" av1_parser_select="cbs_av1" evc_parser_select="evcparse" +ffv1_parser_select="rangecoder" ftr_parser_select="adts_header mpeg4audio" h264_parser_select="golomb h264dsp h264parse h264_sei" hevc_parser_select="hevcparse hevc_sei" diff --git a/libavcodec/Makefile b/libavcodec/Makefile index a3ef11a258..1df595d58f 100644 --- a/libavcodec/Makefile +++ b/libavcodec/Makefile @@ -1207,6 +1207,7 @@ OBJS-$(CONFIG_DVBSUB_PARSER) += dvbsub_parser.o OBJS-$(CONFIG_DVD_NAV_PARSER) += dvd_nav_parser.o OBJS-$(CONFIG_DVDSUB_PARSER) += dvdsub_parser.o OBJS-$(CONFIG_EVC_PARSER) += evc_parser.o +OBJS-$(CONFIG_FFV1_PARSER) += ffv1_parser.o OBJS-$(CONFIG_FLAC_PARSER) += flac_parser.o flacdata.o flac.o OBJS-$(CONFIG_FTR_PARSER) += ftr_parser.o OBJS-$(CONFIG_G723_1_PARSER) += g723_1_parser.o diff --git a/libavcodec/ffv1_parser.c b/libavcodec/ffv1_parser.c new file mode 100644 index 0000000000..f9fd1152d0 --- /dev/null +++ b/libavcodec/ffv1_parser.c @@ -0,0 +1,45 @@ +/* + * 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 "avcodec.h" +#include "rangecoder.h" + +static int parse(AVCodecParserContext *s, + AVCodecContext *avctx, + const uint8_t **poutbuf, int *poutbuf_size, + const uint8_t *buf, int buf_size) +{ + RangeCoder c; + uint8_t keystate = 128; + ff_init_range_decoder(&c, buf, buf_size); + ff_build_rac_states(&c, 0.05 * (1LL << 32), 256 - 8); + + *poutbuf = buf; + *poutbuf_size = buf_size; + s->key_frame = get_rac(&c, &keystate); + s->pict_type = AV_PICTURE_TYPE_I; //FIXME I vs. P, see ffv1dec.c + s->field_order = AV_FIELD_UNKNOWN; + s->picture_structure = AV_PICTURE_STRUCTURE_UNKNOWN; + + return buf_size;
You should consider exposing expose read_header() from ffv1dec.c, or maybe decode_header(), which would give you everything else. This patch would also help with hardware decoding, as a software decoder wouldn't be spun up during probing.
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