PR #21021 opened by James Almer (jamrial) URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21021 Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21021.patch
>From 7ea9e672d8a4e6bdae507787cca64c79efbe425d Mon Sep 17 00:00:00 2001 From: James Almer <[email protected]> Date: Tue, 25 Nov 2025 18:55:35 -0300 Subject: [PATCH] avcodec/cavs_parser: parse sequence headers for stream parameters Signed-off-by: James Almer <[email protected]> --- libavcodec/cavs_parser.c | 81 +++++++++++++++++++++++++ tests/ref/fate/cavs-demux | 120 +++++++++++++++++++------------------- 2 files changed, 141 insertions(+), 60 deletions(-) diff --git a/libavcodec/cavs_parser.c b/libavcodec/cavs_parser.c index 13fbd009c8..b13af8e14d 100644 --- a/libavcodec/cavs_parser.c +++ b/libavcodec/cavs_parser.c @@ -27,7 +27,10 @@ #include "parser.h" #include "cavs.h" +#include "get_bits.h" +#include "mpeg12data.h" #include "parser_internal.h" +#include "startcode.h" /** @@ -73,6 +76,81 @@ static int cavs_find_frame_end(ParseContext *pc, const uint8_t *buf, return END_NOT_FOUND; } +static int decode_seq_header(AVCodecParserContext *s, AVCodecContext *avctx, + GetBitContext *gb) +{ + int frame_rate_code; + int width, height; + int mb_width, mb_height; + + skip_bits(gb, 8); // profile + skip_bits(gb, 8); // level + skip_bits1(gb); // progressive sequence + + width = get_bits(gb, 14); + height = get_bits(gb, 14); + if (width <= 0 || height <= 0) { + av_log(avctx, AV_LOG_ERROR, "Dimensions invalid\n"); + return AVERROR_INVALIDDATA; + } + mb_width = (width + 15) >> 4; + mb_height = (height + 15) >> 4; + + skip_bits(gb, 2); // chroma format + skip_bits(gb, 3); // sample_precision + skip_bits(gb, 4); // aspect_ratio + frame_rate_code = get_bits(gb, 4); + if (frame_rate_code == 0 || frame_rate_code > 13) { + av_log(avctx, AV_LOG_WARNING, + "frame_rate_code %d is invalid\n", frame_rate_code); + frame_rate_code = 1; + } + + skip_bits(gb, 18); // bit_rate_lower + skip_bits1(gb); // marker_bit + skip_bits(gb, 12); // bit_rate_upper + skip_bits1(gb); // low_delay + + s->width = width; + s->height = height; + s->coded_width = 16 * mb_width; + s->coded_height = 16 * mb_height; + avctx->pix_fmt = AV_PIX_FMT_YUV420P; + avctx->framerate = ff_mpeg12_frame_rate_tab[frame_rate_code]; + + return 0; +} + +static int cavs_parse_frame(AVCodecParserContext *s, AVCodecContext *avctx, + const uint8_t *buf, int buf_size) +{ + GetBitContext gb; + const uint8_t *buf_end; + const uint8_t *buf_ptr; + int frame_start = 0; + + if (buf_size == 0) + return 0; + + buf_ptr = buf; + buf_end = buf + buf_size; + for (;;) { + uint32_t stc = -1; + buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &stc); + if ((stc & 0xFFFFFE00) || buf_ptr == buf_end) + return 0; + int input_size = (buf_end - buf_ptr) * 8; + switch (stc) { + case CAVS_START_CODE: + init_get_bits(&gb, buf_ptr, input_size); + decode_seq_header(s, avctx, &gb); + break; + default: + break; + } + } +} + static int cavsvideo_parse(AVCodecParserContext *s, AVCodecContext *avctx, const uint8_t **poutbuf, int *poutbuf_size, @@ -92,6 +170,9 @@ static int cavsvideo_parse(AVCodecParserContext *s, return buf_size; } } + + cavs_parse_frame(s, avctx, buf, buf_size); + *poutbuf = buf; *poutbuf_size = buf_size; return next; diff --git a/tests/ref/fate/cavs-demux b/tests/ref/fate/cavs-demux index b1e2c2fd25..0884950ad4 100644 --- a/tests/ref/fate/cavs-demux +++ b/tests/ref/fate/cavs-demux @@ -1,62 +1,62 @@ -packet|codec_type=video|stream_index=0|pts=0|pts_time=0.000000|dts=0|dts_time=0.000000|duration=48000|duration_time=0.040000|size=14447|pos=0|flags=K__|data_hash=CRC32:83f257c0 -packet|codec_type=video|stream_index=0|pts=48000|pts_time=0.040000|dts=48000|dts_time=0.040000|duration=48000|duration_time=0.040000|size=483|pos=14447|flags=K__|data_hash=CRC32:5abb82f8 -packet|codec_type=video|stream_index=0|pts=96000|pts_time=0.080000|dts=96000|dts_time=0.080000|duration=48000|duration_time=0.040000|size=18|pos=14930|flags=K__|data_hash=CRC32:b8b123d8 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