/src/ffmpeg/libavcodec/g729_parser.c

Source
/*
 * 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 "parser.h"
#include "g729.h"
#include "parser_internal.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) {
        /* 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;
        if (avctx->codec_id == AV_CODEC_ID_ACELP_KELVIN)
            s->block_size++;
        // channels > 2 is invalid, we pass the packet on unchanged
        if (avctx->ch_layout.nb_channels > 2)
            s->block_size = 0;
        s->block_size *= avctx->ch_layout.nb_channels;
        s->duration   = avctx->frame_size;
    }

    if (!s->block_size) {
        *poutbuf      = buf;
        *poutbuf_size = buf_size;
        return buf_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;
}

const FFCodecParser ff_g729_parser = {
    PARSER_CODEC_LIST(AV_CODEC_ID_G729, AV_CODEC_ID_ACELP_KELVIN),
    .priv_data_size = sizeof(G729ParseContext),
    .parse          = g729_parse,
    .close          = ff_parse_close,
};

Line	Count	Source
1		/*
2		* Copyright (c) 2015 Ganesh Ajjanagadde
3		*
4		* This file is part of FFmpeg.
5		*
6		* FFmpeg is free software; you can redistribute it and/or
7		* modify it under the terms of the GNU Lesser General Public
8		* License as published by the Free Software Foundation; either
9		* version 2.1 of the License, or (at your option) any later version.
10		*
11		* FFmpeg is distributed in the hope that it will be useful,
12		* but WITHOUT ANY WARRANTY; without even the implied warranty of
13		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14		* Lesser General Public License for more details.
15		*
16		* You should have received a copy of the GNU Lesser General Public
17		* License along with FFmpeg; if not, write to the Free Software
18		* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19		*/
20
21		/**
22		* @file
23		* G.729 audio parser
24		*
25		* Splits packets into individual blocks.
26		*/
27
28		#include "parser.h"
29		#include "g729.h"
30		#include "parser_internal.h"
31
32		typedef struct G729ParseContext {
33		ParseContext pc;
34		int block_size;
35		int duration;
36		int remaining;
37		} G729ParseContext;
38
39		static int g729_parse(AVCodecParserContext s1, AVCodecContext avctx,
40		const uint8_t *poutbuf, int poutbuf_size,
41		const uint8_t *buf, int buf_size)
42	104k	{
43	104k	G729ParseContext *s = s1->priv_data;
44	104k	ParseContext *pc = &s->pc;
45	104k	int next;
46
47	104k	if (!s->block_size) {
48		/* FIXME: replace this heuristic block_size with more precise estimate */
49	103k	s->block_size = (avctx->bit_rate < 8000) ? G729D_6K4_BLOCK_SIZE : G729_8K_BLOCK_SIZE;
50	103k	if (avctx->codec_id == AV_CODEC_ID_ACELP_KELVIN)
51	31.2k	s->block_size++;
52		// channels > 2 is invalid, we pass the packet on unchanged
53	103k	if (avctx->ch_layout.nb_channels > 2)
54	40	s->block_size = 0;
55	103k	s->block_size *= avctx->ch_layout.nb_channels;
56	103k	s->duration = avctx->frame_size;
57	103k	}
58
59	104k	if (!s->block_size) {
60	103k	*poutbuf = buf;
61	103k	*poutbuf_size = buf_size;
62	103k	return buf_size;
63	103k	}
64
65	454	if (!s->remaining)
66	444	s->remaining = s->block_size;
67	454	if (s->remaining <= buf_size) {
68	438	next = s->remaining;
69	438	s->remaining = 0;
70	438	} else {
71	16	next = END_NOT_FOUND;
72	16	s->remaining -= buf_size;
73	16	}
74
75	454	if (ff_combine_frame(pc, next, &buf, &buf_size) < 0 \|\| !buf_size) {
76	11	*poutbuf = NULL;
77	11	*poutbuf_size = 0;
78	11	return buf_size;
79	11	}
80
81	443	s1->duration = s->duration;
82
83	443	*poutbuf = buf;
84	443	*poutbuf_size = buf_size;
85	443	return next;
86	454	}
87
88		const FFCodecParser ff_g729_parser = {
89		PARSER_CODEC_LIST(AV_CODEC_ID_G729, AV_CODEC_ID_ACELP_KELVIN),
90		.priv_data_size = sizeof(G729ParseContext),
91		.parse = g729_parse,
92		.close = ff_parse_close,
93		};

Coverage Report

Created: 2026-02-14 06:59