diff options
Diffstat (limited to 'libavcodec/g729_parser.c')
-rw-r--r-- | libavcodec/g729_parser.c | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/libavcodec/g729_parser.c b/libavcodec/g729_parser.c new file mode 100644 index 0000000..d13c990 --- /dev/null +++ b/libavcodec/g729_parser.c @@ -0,0 +1,82 @@ +/* + * Copyright (c) 2015 Ganesh Ajjanagadde + * + * 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 + * G.729 audio parser + * + * Splits packets into individual blocks. + */ + +#include "libavutil/avassert.h" +#include "parser.h" +#include "g729.h" + +typedef struct G729ParseContext { + ParseContext pc; + int block_size; + int duration; + int remaining; +} G729ParseContext; + +static int g729_parse(AVCodecParserContext *s1, AVCodecContext *avctx, + const uint8_t **poutbuf, int *poutbuf_size, + const uint8_t *buf, int buf_size) +{ + G729ParseContext *s = s1->priv_data; + ParseContext *pc = &s->pc; + int next; + + if (!s->block_size) { + av_assert1(avctx->codec_id == AV_CODEC_ID_G729); + /* FIXME: replace this heuristic block_size with more precise estimate */ + s->block_size = (avctx->bit_rate < 8000) ? G729D_6K4_BLOCK_SIZE : G729_8K_BLOCK_SIZE; + s->duration = avctx->frame_size; + } + + if (!s->remaining) + s->remaining = s->block_size; + if (s->remaining <= buf_size) { + next = s->remaining; + s->remaining = 0; + } else { + next = END_NOT_FOUND; + s->remaining -= buf_size; + } + + if (ff_combine_frame(pc, next, &buf, &buf_size) < 0 || !buf_size) { + *poutbuf = NULL; + *poutbuf_size = 0; + return buf_size; + } + + s1->duration = s->duration; + + *poutbuf = buf; + *poutbuf_size = buf_size; + return next; +} + +AVCodecParser ff_g729_parser = { + .codec_ids = { AV_CODEC_ID_G729 }, + .priv_data_size = sizeof(G729ParseContext), + .parser_parse = g729_parse, + .parser_close = ff_parse_close, +}; |