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1 | /* |
2 | * Interface to libgsm for GSM encoding | |
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 encoding | |
26 | */ | |
27 | ||
28 | // The idiosyncrasies of GSM-in-WAV are explained at http://kbs.cs.tu-berlin.de/~jutta/toast.html | |
29 | ||
30 | #include "config.h" | |
31 | #if HAVE_GSM_H | |
32 | #include <gsm.h> | |
33 | #else | |
34 | #include <gsm/gsm.h> | |
35 | #endif | |
36 | ||
37 | #include "libavutil/common.h" | |
38 | ||
39 | #include "avcodec.h" | |
40 | #include "internal.h" | |
41 | #include "gsm.h" | |
42 | ||
43 | static av_cold int libgsm_encode_close(AVCodecContext *avctx) { | |
44 | gsm_destroy(avctx->priv_data); | |
45 | avctx->priv_data = NULL; | |
46 | return 0; | |
47 | } | |
48 | ||
49 | static av_cold int libgsm_encode_init(AVCodecContext *avctx) { | |
50 | if (avctx->channels > 1) { | |
51 | av_log(avctx, AV_LOG_ERROR, "Mono required for GSM, got %d channels\n", | |
52 | avctx->channels); | |
53 | return -1; | |
54 | } | |
55 | ||
56 | if (avctx->sample_rate != 8000) { | |
57 | av_log(avctx, AV_LOG_ERROR, "Sample rate 8000Hz required for GSM, got %dHz\n", | |
58 | avctx->sample_rate); | |
59 | if (avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) | |
60 | return -1; | |
61 | } | |
62 | if (avctx->bit_rate != 13000 /* Official */ && | |
63 | avctx->bit_rate != 13200 /* Very common */ && | |
64 | avctx->bit_rate != 0 /* Unknown; a.o. mov does not set bitrate when decoding */ ) { | |
65 | av_log(avctx, AV_LOG_ERROR, "Bitrate 13000bps required for GSM, got %dbps\n", | |
66 | avctx->bit_rate); | |
67 | if (avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) | |
68 | return -1; | |
69 | } | |
70 | ||
71 | avctx->priv_data = gsm_create(); | |
72 | if (!avctx->priv_data) | |
73 | goto error; | |
74 | ||
75 | switch(avctx->codec_id) { | |
76 | case AV_CODEC_ID_GSM: | |
77 | avctx->frame_size = GSM_FRAME_SIZE; | |
78 | avctx->block_align = GSM_BLOCK_SIZE; | |
79 | break; | |
80 | case AV_CODEC_ID_GSM_MS: { | |
81 | int one = 1; | |
82 | gsm_option(avctx->priv_data, GSM_OPT_WAV49, &one); | |
83 | avctx->frame_size = 2*GSM_FRAME_SIZE; | |
84 | avctx->block_align = GSM_MS_BLOCK_SIZE; | |
85 | } | |
86 | } | |
87 | ||
88 | return 0; | |
89 | error: | |
90 | libgsm_encode_close(avctx); | |
91 | return -1; | |
92 | } | |
93 | ||
94 | static int libgsm_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, | |
95 | const AVFrame *frame, int *got_packet_ptr) | |
96 | { | |
97 | int ret; | |
98 | gsm_signal *samples = (gsm_signal *)frame->data[0]; | |
99 | struct gsm_state *state = avctx->priv_data; | |
100 | ||
101 | if ((ret = ff_alloc_packet2(avctx, avpkt, avctx->block_align)) < 0) | |
102 | return ret; | |
103 | ||
104 | switch(avctx->codec_id) { | |
105 | case AV_CODEC_ID_GSM: | |
106 | gsm_encode(state, samples, avpkt->data); | |
107 | break; | |
108 | case AV_CODEC_ID_GSM_MS: | |
109 | gsm_encode(state, samples, avpkt->data); | |
110 | gsm_encode(state, samples + GSM_FRAME_SIZE, avpkt->data + 32); | |
111 | } | |
112 | ||
113 | *got_packet_ptr = 1; | |
114 | return 0; | |
115 | } | |
116 | ||
117 | ||
118 | #if CONFIG_LIBGSM_ENCODER | |
119 | AVCodec ff_libgsm_encoder = { | |
120 | .name = "libgsm", | |
121 | .long_name = NULL_IF_CONFIG_SMALL("libgsm GSM"), | |
122 | .type = AVMEDIA_TYPE_AUDIO, | |
123 | .id = AV_CODEC_ID_GSM, | |
124 | .init = libgsm_encode_init, | |
125 | .encode2 = libgsm_encode_frame, | |
126 | .close = libgsm_encode_close, | |
127 | .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16, | |
128 | AV_SAMPLE_FMT_NONE }, | |
129 | }; | |
130 | #endif | |
131 | #if CONFIG_LIBGSM_MS_ENCODER | |
132 | AVCodec ff_libgsm_ms_encoder = { | |
133 | .name = "libgsm_ms", | |
134 | .long_name = NULL_IF_CONFIG_SMALL("libgsm GSM Microsoft variant"), | |
135 | .type = AVMEDIA_TYPE_AUDIO, | |
136 | .id = AV_CODEC_ID_GSM_MS, | |
137 | .init = libgsm_encode_init, | |
138 | .encode2 = libgsm_encode_frame, | |
139 | .close = libgsm_encode_close, | |
140 | .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16, | |
141 | AV_SAMPLE_FMT_NONE }, | |
142 | }; | |
143 | #endif |