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 "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 if (!avctx->sample_rate)
40 avctx->sample_rate = 8000;
41 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
43 switch (avctx->codec_id) {
45 avctx->frame_size = GSM_FRAME_SIZE;
46 avctx->block_align = GSM_BLOCK_SIZE;
48 case AV_CODEC_ID_GSM_MS:
49 avctx->frame_size = 2 * GSM_FRAME_SIZE;
50 avctx->block_align = GSM_MS_BLOCK_SIZE;
56 static int gsm_decode_frame(AVCodecContext *avctx, void *data,
57 int *got_frame_ptr, AVPacket *avpkt)
59 AVFrame *frame = data;
62 const uint8_t *buf = avpkt->data;
63 int buf_size = avpkt->size;
66 if (buf_size < avctx->block_align) {
67 av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
68 return AVERROR_INVALIDDATA;
71 /* get output buffer */
72 frame->nb_samples = avctx->frame_size;
73 if ((res = ff_get_buffer(avctx, frame, 0)) < 0)
75 samples = (int16_t *)frame->data[0];
77 switch (avctx->codec_id) {
79 init_get_bits(&gb, buf, buf_size * 8);
80 if (get_bits(&gb, 4) != 0xd)
81 av_log(avctx, AV_LOG_WARNING, "Missing GSM magic!\n");
82 res = gsm_decode_block(avctx, samples, &gb);
86 case AV_CODEC_ID_GSM_MS:
87 res = ff_msgsm_decode_block(avctx, samples, buf);
94 return avctx->block_align;
97 static void gsm_flush(AVCodecContext *avctx)
99 GSMContext *s = avctx->priv_data;
100 memset(s, 0, sizeof(*s));
103 #if CONFIG_GSM_DECODER
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 #if CONFIG_GSM_MS_DECODER
117 AVCodec ff_gsm_ms_decoder = {
119 .type = AVMEDIA_TYPE_AUDIO,
120 .id = AV_CODEC_ID_GSM_MS,
121 .priv_data_size = sizeof(GSMContext),
123 .decode = gsm_decode_frame,
125 .capabilities = CODEC_CAP_DR1,
126 .long_name = NULL_IF_CONFIG_SMALL("GSM Microsoft variant"),