diff options
author | Paul B Mahol <onemda@gmail.com> | 2021-09-30 14:29:48 +0200 |
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committer | Paul B Mahol <onemda@gmail.com> | 2021-10-02 18:49:40 +0200 |
commit | 1f447fd95463bbf39a78d886359a3006d82f6a94 (patch) | |
tree | f072f2bd35fa1db69dd3925b3ea6a0d479abf3cd /libavcodec | |
parent | 8ae0ef532717278492f6d80fc26fad1030ee25f1 (diff) |
avcodec: add amr parser
Diffstat (limited to 'libavcodec')
-rw-r--r-- | libavcodec/Makefile | 1 | ||||
-rw-r--r-- | libavcodec/amr_parser.c | 103 | ||||
-rw-r--r-- | libavcodec/parsers.c | 1 | ||||
-rw-r--r-- | libavcodec/version.h | 4 |
4 files changed, 107 insertions, 2 deletions
diff --git a/libavcodec/Makefile b/libavcodec/Makefile index 8012b69f61..ce928720e1 100644 --- a/libavcodec/Makefile +++ b/libavcodec/Makefile @@ -1078,6 +1078,7 @@ OBJS-$(CONFIG_AAC_PARSER) += aac_parser.o aac_ac3_parser.o \ mpeg4audio.o OBJS-$(CONFIG_AC3_PARSER) += ac3tab.o aac_ac3_parser.o OBJS-$(CONFIG_ADX_PARSER) += adx_parser.o adx.o +OBJS-$(CONFIG_AMR_PARSER) += amr_parser.o OBJS-$(CONFIG_AV1_PARSER) += av1_parser.o OBJS-$(CONFIG_AVS2_PARSER) += avs2_parser.o OBJS-$(CONFIG_AVS3_PARSER) += avs3_parser.o diff --git a/libavcodec/amr_parser.c b/libavcodec/amr_parser.c new file mode 100644 index 0000000000..2659cb40d7 --- /dev/null +++ b/libavcodec/amr_parser.c @@ -0,0 +1,103 @@ +/* + * Copyright (c) 2021 Paul B Mahol + * + * 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 + */ + +/** + * @file + * AMR audio parser + * + * Splits packets into individual blocks. + */ + +#include "libavutil/intreadwrite.h" +#include "parser.h" + +static const uint8_t amrnb_packed_size[16] = { + 13, 14, 16, 18, 20, 21, 27, 32, 6, 1, 1, 1, 1, 1, 1, 1 +}; +static const uint8_t amrwb_packed_size[16] = { + 18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 1, 1, 1, 1, 1, 1 +}; + +typedef struct AMRParseContext { + ParseContext pc; + uint64_t cumulated_size; + uint64_t block_count; + int remaining; +} AMRParseContext; + +static int amr_parse(AVCodecParserContext *s1, + AVCodecContext *avctx, + const uint8_t **poutbuf, int *poutbuf_size, + const uint8_t *buf, int buf_size) +{ + AMRParseContext *s = s1->priv_data; + ParseContext *pc = &s->pc; + int next = END_NOT_FOUND; + + *poutbuf_size = 0; + *poutbuf = NULL; + + if (s1->flags & PARSER_FLAG_COMPLETE_FRAMES) { + next = buf_size; + } else { + if (s->remaining) { + next = s->remaining; + } else { + int mode = (buf[0] >> 3) & 0x0F; + + if (avctx->codec_id == AV_CODEC_ID_AMR_NB) { + next = amrnb_packed_size[mode]; + } else if (avctx->codec_id == AV_CODEC_ID_AMR_WB) { + next = amrwb_packed_size[mode]; + } + } + + s->remaining = next - FFMIN(buf_size, next); + if (s->remaining) + next = END_NOT_FOUND; + + if (next != END_NOT_FOUND) { + if (s->cumulated_size < UINT64_MAX - next) { + s->cumulated_size += next; + /* Both AMR formats have 50 frames per second */ + avctx->bit_rate = s->cumulated_size / ++s->block_count * 8 * 50; + } + } + + if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) { + *poutbuf = NULL; + *poutbuf_size = 0; + return buf_size; + } + } + + s1->duration = avctx->codec_id == AV_CODEC_ID_AMR_NB ? 160 : 320; + + *poutbuf = buf; + *poutbuf_size = buf_size; + return next; +} + +const AVCodecParser ff_amr_parser = { + .codec_ids = { AV_CODEC_ID_AMR_NB, AV_CODEC_ID_AMR_WB }, + .priv_data_size = sizeof(AMRParseContext), + .parser_parse = amr_parse, + .parser_close = ff_parse_close, +}; diff --git a/libavcodec/parsers.c b/libavcodec/parsers.c index 5ab1a226d9..6b40c18d80 100644 --- a/libavcodec/parsers.c +++ b/libavcodec/parsers.c @@ -24,6 +24,7 @@ extern const AVCodecParser ff_aac_parser; extern const AVCodecParser ff_aac_latm_parser; extern const AVCodecParser ff_ac3_parser; extern const AVCodecParser ff_adx_parser; +extern const AVCodecParser ff_amr_parser; extern const AVCodecParser ff_av1_parser; extern const AVCodecParser ff_avs2_parser; extern const AVCodecParser ff_avs3_parser; diff --git a/libavcodec/version.h b/libavcodec/version.h index 70c4e4d0fe..4bd22f7e93 100644 --- a/libavcodec/version.h +++ b/libavcodec/version.h @@ -28,8 +28,8 @@ #include "libavutil/version.h" #define LIBAVCODEC_VERSION_MAJOR 59 -#define LIBAVCODEC_VERSION_MINOR 9 -#define LIBAVCODEC_VERSION_MICRO 101 +#define LIBAVCODEC_VERSION_MINOR 10 +#define LIBAVCODEC_VERSION_MICRO 100 #define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \ LIBAVCODEC_VERSION_MINOR, \ |