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"
33 #include "gsmdec_template.c"
35 static av_cold int gsm_init(AVCodecContext *avctx)
38 avctx->channel_layout = AV_CH_LAYOUT_MONO;
39 avctx->sample_rate = 8000;
40 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
42 switch (avctx->codec_id) {
44 avctx->frame_size = GSM_FRAME_SIZE;
45 avctx->block_align = GSM_BLOCK_SIZE;
47 case AV_CODEC_ID_GSM_MS:
48 avctx->frame_size = 2 * GSM_FRAME_SIZE;
49 avctx->block_align = GSM_MS_BLOCK_SIZE;
55 static int gsm_decode_frame(AVCodecContext *avctx, void *data,
56 int *got_frame_ptr, AVPacket *avpkt)
58 AVFrame *frame = data;
61 const uint8_t *buf = avpkt->data;
62 int buf_size = avpkt->size;
65 if (buf_size < avctx->block_align) {
66 av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
67 return AVERROR_INVALIDDATA;
70 /* get output buffer */
71 frame->nb_samples = avctx->frame_size;
72 if ((res = ff_get_buffer(avctx, frame)) < 0) {
73 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
76 samples = (int16_t *)frame->data[0];
78 switch (avctx->codec_id) {
80 init_get_bits(&gb, buf, buf_size * 8);
81 if (get_bits(&gb, 4) != 0xd)
82 av_log(avctx, AV_LOG_WARNING, "Missing GSM magic!\n");
83 res = gsm_decode_block(avctx, samples, &gb);
87 case AV_CODEC_ID_GSM_MS:
88 res = ff_msgsm_decode_block(avctx, samples, buf);
95 return avctx->block_align;
98 static void gsm_flush(AVCodecContext *avctx)
100 GSMContext *s = avctx->priv_data;
101 memset(s, 0, sizeof(*s));
104 AVCodec ff_gsm_decoder = {
106 .type = AVMEDIA_TYPE_AUDIO,
107 .id = AV_CODEC_ID_GSM,
108 .priv_data_size = sizeof(GSMContext),
110 .decode = gsm_decode_frame,
112 .capabilities = CODEC_CAP_DR1,
113 .long_name = NULL_IF_CONFIG_SMALL("GSM"),
116 AVCodec ff_gsm_ms_decoder = {
118 .type = AVMEDIA_TYPE_AUDIO,
119 .id = AV_CODEC_ID_GSM_MS,
120 .priv_data_size = sizeof(GSMContext),
122 .decode = gsm_decode_frame,
124 .capabilities = CODEC_CAP_DR1,
125 .long_name = NULL_IF_CONFIG_SMALL("GSM Microsoft variant"),