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)
37 GSMContext *s = avctx->priv_data;
40 avctx->channel_layout = AV_CH_LAYOUT_MONO;
41 if (!avctx->sample_rate)
42 avctx->sample_rate = 8000;
43 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
45 switch (avctx->codec_id) {
47 avctx->frame_size = GSM_FRAME_SIZE;
48 avctx->block_align = GSM_BLOCK_SIZE;
50 case AV_CODEC_ID_GSM_MS:
51 avctx->frame_size = 2 * GSM_FRAME_SIZE;
52 avctx->block_align = GSM_MS_BLOCK_SIZE;
55 avcodec_get_frame_defaults(&s->frame);
56 avctx->coded_frame = &s->frame;
61 static int gsm_decode_frame(AVCodecContext *avctx, void *data,
62 int *got_frame_ptr, AVPacket *avpkt)
64 GSMContext *s = avctx->priv_data;
67 const uint8_t *buf = avpkt->data;
68 int buf_size = avpkt->size;
71 if (buf_size < avctx->block_align) {
72 av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
73 return AVERROR_INVALIDDATA;
76 /* get output buffer */
77 s->frame.nb_samples = avctx->frame_size;
78 if ((res = ff_get_buffer(avctx, &s->frame)) < 0) {
79 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
82 samples = (int16_t *)s->frame.data[0];
84 switch (avctx->codec_id) {
86 init_get_bits(&gb, buf, buf_size * 8);
87 if (get_bits(&gb, 4) != 0xd)
88 av_log(avctx, AV_LOG_WARNING, "Missing GSM magic!\n");
89 res = gsm_decode_block(avctx, samples, &gb);
93 case AV_CODEC_ID_GSM_MS:
94 res = ff_msgsm_decode_block(avctx, samples, buf);
100 *(AVFrame *)data = s->frame;
102 return avctx->block_align;
105 static void gsm_flush(AVCodecContext *avctx)
107 GSMContext *s = avctx->priv_data;
108 memset(s, 0, sizeof(*s));
111 #if CONFIG_GSM_DECODER
112 AVCodec ff_gsm_decoder = {
114 .type = AVMEDIA_TYPE_AUDIO,
115 .id = AV_CODEC_ID_GSM,
116 .priv_data_size = sizeof(GSMContext),
118 .decode = gsm_decode_frame,
120 .capabilities = CODEC_CAP_DR1,
121 .long_name = NULL_IF_CONFIG_SMALL("GSM"),
124 #if CONFIG_GSM_MS_DECODER
125 AVCodec ff_gsm_ms_decoder = {
127 .type = AVMEDIA_TYPE_AUDIO,
128 .id = AV_CODEC_ID_GSM_MS,
129 .priv_data_size = sizeof(GSMContext),
131 .decode = gsm_decode_frame,
133 .capabilities = CODEC_CAP_DR1,
134 .long_name = NULL_IF_CONFIG_SMALL("GSM Microsoft variant"),