3 * Copyright (c) 2010 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
27 #include "libavutil/channel_layout.h"
30 #include "bitstream.h"
34 #include "gsmdec_template.c"
36 static av_cold int gsm_init(AVCodecContext *avctx)
39 avctx->channel_layout = AV_CH_LAYOUT_MONO;
40 if (!avctx->sample_rate)
41 avctx->sample_rate = 8000;
42 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
44 switch (avctx->codec_id) {
46 avctx->frame_size = GSM_FRAME_SIZE;
47 avctx->block_align = GSM_BLOCK_SIZE;
49 case AV_CODEC_ID_GSM_MS:
50 avctx->frame_size = 2 * GSM_FRAME_SIZE;
51 if (!avctx->block_align)
52 avctx->block_align = GSM_MS_BLOCK_SIZE;
54 if (avctx->block_align < MSN_MIN_BLOCK_SIZE ||
55 avctx->block_align > GSM_MS_BLOCK_SIZE ||
56 (avctx->block_align - MSN_MIN_BLOCK_SIZE) % 3) {
57 av_log(avctx, AV_LOG_ERROR, "Invalid block alignment %d\n",
59 return AVERROR_INVALIDDATA;
66 static int gsm_decode_frame(AVCodecContext *avctx, void *data,
67 int *got_frame_ptr, AVPacket *avpkt)
69 AVFrame *frame = data;
72 const uint8_t *buf = avpkt->data;
73 int buf_size = avpkt->size;
76 if (buf_size < avctx->block_align) {
77 av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
78 return AVERROR_INVALIDDATA;
81 /* get output buffer */
82 frame->nb_samples = avctx->frame_size;
83 if ((res = ff_get_buffer(avctx, frame, 0)) < 0) {
84 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
87 samples = (int16_t *)frame->data[0];
89 switch (avctx->codec_id) {
91 bitstream_init8(&bc, buf, buf_size);
92 if (bitstream_read(&bc, 4) != 0xd)
93 av_log(avctx, AV_LOG_WARNING, "Missing GSM magic!\n");
94 res = gsm_decode_block(avctx, samples, &bc, GSM_13000);
98 case AV_CODEC_ID_GSM_MS:
99 res = ff_msgsm_decode_block(avctx, samples, buf,
100 (GSM_MS_BLOCK_SIZE - avctx->block_align) / 3);
107 return avctx->block_align;
110 static void gsm_flush(AVCodecContext *avctx)
112 GSMContext *s = avctx->priv_data;
113 memset(s, 0, sizeof(*s));
116 AVCodec ff_gsm_decoder = {
118 .long_name = NULL_IF_CONFIG_SMALL("GSM"),
119 .type = AVMEDIA_TYPE_AUDIO,
120 .id = AV_CODEC_ID_GSM,
121 .priv_data_size = sizeof(GSMContext),
123 .decode = gsm_decode_frame,
125 .capabilities = AV_CODEC_CAP_DR1,
128 AVCodec ff_gsm_ms_decoder = {
130 .long_name = NULL_IF_CONFIG_SMALL("GSM Microsoft variant"),
131 .type = AVMEDIA_TYPE_AUDIO,
132 .id = AV_CODEC_ID_GSM_MS,
133 .priv_data_size = sizeof(GSMContext),
135 .decode = gsm_decode_frame,
137 .capabilities = AV_CODEC_CAP_DR1,