1 /*
2 * Interface to libgsm for GSM decoding
3 * Copyright (c) 2005 Alban Bedel <albeu@free.fr>
4 * Copyright (c) 2006, 2007 Michel Bardiaux <mbardiaux@mediaxim.be>
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 /**
24 * @file
25 * Interface to libgsm for GSM decoding
26 */
27
28 // The idiosyncrasies of GSM-in-WAV are explained at http://kbs.cs.tu-berlin.de/~jutta/toast.html
29
31 #if HAVE_GSM_H
33 #else
34 #include <gsm/gsm.h>
35 #endif
36
39
43
47
50
56
57 s->
state = gsm_create();
58
63 break;
65 int one = 1;
66 gsm_option(s->
state, GSM_OPT_WAV49, &one);
69 }
70 }
71
72 return 0;
73 }
74
77
78 gsm_destroy(s->
state);
80 return 0;
81 }
82
85 {
86 int i, ret;
90 int buf_size = avpkt->
size;
91 int16_t *samples;
92
93 if (buf_size < avctx->block_align) {
96 }
97
98 /* get output buffer */
101 return ret;
102 samples = (int16_t *)frame->
data[0];
103
105 if ((ret = gsm_decode(s->
state, buf, samples)) < 0)
106 return -1;
109 }
110
111 *got_frame_ptr = 1;
112
114 }
115
118 int one = 1;
119
120 gsm_destroy(s->
state);
121 s->
state = gsm_create();
123 gsm_option(s->
state, GSM_OPT_WAV49, &one);
124 }
125
126 #if CONFIG_LIBGSM_DECODER
138 };
139 #endif
140 #if CONFIG_LIBGSM_MS_DECODER
141 AVCodec ff_libgsm_ms_decoder = {
152 };
153 #endif
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
This structure describes decoded (raw) audio or video data.
ptrdiff_t const GLvoid * data
static void flush(AVCodecContext *avctx)
static av_cold int init(AVCodecContext *avctx)
static int libgsm_decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
int block_align
number of bytes per packet if constant and known or 0 Used by some WAV based audio codecs...
enum AVSampleFormat sample_fmt
audio sample format
#define GSM_MS_BLOCK_SIZE
static av_cold int libgsm_decode_init(AVCodecContext *avctx)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
const char * name
Name of the codec implementation.
static void libgsm_flush(AVCodecContext *avctx)
uint64_t channel_layout
Audio channel layout.
audio channel layout utility functions
int frame_size
Number of samples per channel in an audio frame.
Libavcodec external API header.
int sample_rate
samples per second
main external API structure.
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
static av_cold int libgsm_decode_close(AVCodecContext *avctx)
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)
common internal api header.
common internal and external API header
as in Berlin toast format
int channels
number of audio channels
#define AV_CH_LAYOUT_MONO
This structure stores compressed data.
int nb_samples
number of audio samples (per channel) described by this frame
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.