diff options
Diffstat (limited to 'libavcodec/sipr_parser.c')
-rw-r--r-- | libavcodec/sipr_parser.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/libavcodec/sipr_parser.c b/libavcodec/sipr_parser.c new file mode 100644 index 0000000000..fba25e1028 --- /dev/null +++ b/libavcodec/sipr_parser.c @@ -0,0 +1,74 @@ +/* + * 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 + * Sipr audio parser + */ + +#include "parser.h" + +typedef struct SiprParserContext{ + ParseContext pc; +} SiprParserContext; + +static int sipr_split(AVCodecContext *avctx, const uint8_t *buf, int buf_size) +{ + int next; + + switch (avctx->block_align) { + case 20: + case 19: + case 29: + case 37: next = avctx->block_align; break; + default: + if (avctx->bit_rate > 12200) next = 20; + else if (avctx->bit_rate > 7500 ) next = 19; + else if (avctx->bit_rate > 5750 ) next = 29; + else next = 37; + } + + return FFMIN(next, buf_size); +} + +static int sipr_parse(AVCodecParserContext *s1, AVCodecContext *avctx, + const uint8_t **poutbuf, int *poutbuf_size, + const uint8_t *buf, int buf_size) +{ + SiprParserContext *s = s1->priv_data; + ParseContext *pc = &s->pc; + int next; + + next = sipr_split(avctx, 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; +} + +AVCodecParser ff_sipr_parser = { + .codec_ids = { AV_CODEC_ID_SIPR }, + .priv_data_size = sizeof(SiprParserContext), + .parser_parse = sipr_parse, + .parser_close = ff_parse_close, +}; |