3 * Copyright (c) 2010 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
27 #include "config_components.h"
29 #include "libavutil/channel_layout.h"
31 #include "codec_internal.h"
36 #include "gsmdec_template.c"
38 static av_cold int gsm_init(AVCodecContext *avctx)
40 av_channel_layout_uninit(&avctx->ch_layout);
41 avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
42 if (!avctx->sample_rate)
43 avctx->sample_rate = 8000;
44 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
46 switch (avctx->codec_id) {
48 avctx->frame_size = GSM_FRAME_SIZE;
49 avctx->block_align = GSM_BLOCK_SIZE;
51 case AV_CODEC_ID_GSM_MS:
52 avctx->frame_size = 2 * GSM_FRAME_SIZE;
53 if (!avctx->block_align)
54 avctx->block_align = GSM_MS_BLOCK_SIZE;
56 if (avctx->block_align < MSN_MIN_BLOCK_SIZE ||
57 avctx->block_align > GSM_MS_BLOCK_SIZE ||
58 (avctx->block_align - MSN_MIN_BLOCK_SIZE) % 3) {
59 av_log(avctx, AV_LOG_ERROR, "Invalid block alignment %d\n",
61 return AVERROR_INVALIDDATA;
68 static int gsm_decode_frame(AVCodecContext *avctx, AVFrame *frame,
69 int *got_frame_ptr, AVPacket *avpkt)
73 const uint8_t *buf = avpkt->data;
74 int buf_size = avpkt->size;
77 if (buf_size < avctx->block_align) {
78 av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
79 return AVERROR_INVALIDDATA;
82 /* get output buffer */
83 frame->nb_samples = avctx->frame_size;
84 if ((res = ff_get_buffer(avctx, frame, 0)) < 0)
86 samples = (int16_t *)frame->data[0];
88 switch (avctx->codec_id) {
90 init_get_bits(&gb, buf, buf_size * 8);
91 if (get_bits(&gb, 4) != 0xd)
92 av_log(avctx, AV_LOG_WARNING, "Missing GSM magic!\n");
93 res = gsm_decode_block(avctx, samples, &gb, GSM_13000);
97 case AV_CODEC_ID_GSM_MS:
98 res = ff_msgsm_decode_block(avctx, samples, buf,
99 (GSM_MS_BLOCK_SIZE - avctx->block_align) / 3);
106 return avctx->block_align;
109 static void gsm_flush(AVCodecContext *avctx)
111 GSMContext *s = avctx->priv_data;
112 memset(s, 0, sizeof(*s));
115 #if CONFIG_GSM_DECODER
116 const FFCodec ff_gsm_decoder = {
118 CODEC_LONG_NAME("GSM"),
119 .p.type = AVMEDIA_TYPE_AUDIO,
120 .p.id = AV_CODEC_ID_GSM,
121 .priv_data_size = sizeof(GSMContext),
123 FF_CODEC_DECODE_CB(gsm_decode_frame),
125 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
128 #if CONFIG_GSM_MS_DECODER
129 const FFCodec ff_gsm_ms_decoder = {
131 CODEC_LONG_NAME("GSM Microsoft variant"),
132 .p.type = AVMEDIA_TYPE_AUDIO,
133 .p.id = AV_CODEC_ID_GSM_MS,
134 .priv_data_size = sizeof(GSMContext),
136 FF_CODEC_DECODE_CB(gsm_decode_frame),
138 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,