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
31 #include "gsmdec_template.c"
33 static av_cold int gsm_init(AVCodecContext *avctx)
36 if (!avctx->sample_rate)
37 avctx->sample_rate = 8000;
38 avctx->sample_fmt = AV_SAMPLE_FMT_S16;
40 switch (avctx->codec_id) {
42 avctx->frame_size = GSM_FRAME_SIZE;
43 avctx->block_align = GSM_BLOCK_SIZE;
46 avctx->frame_size = 2 * GSM_FRAME_SIZE;
47 avctx->block_align = GSM_MS_BLOCK_SIZE;
53 static int gsm_decode_frame(AVCodecContext *avctx, void *data,
54 int *data_size, AVPacket *avpkt)
58 const uint8_t *buf = avpkt->data;
59 int buf_size = avpkt->size;
60 int16_t *samples = data;
61 int frame_bytes = avctx->frame_size *
62 av_get_bytes_per_sample(avctx->sample_fmt);
64 if (*data_size < frame_bytes) {
65 av_log(avctx, AV_LOG_ERROR, "Output buffer is too small\n");
66 return AVERROR(EINVAL);
69 if (buf_size < avctx->block_align) {
70 av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
71 return AVERROR_INVALIDDATA;
74 switch (avctx->codec_id) {
76 init_get_bits(&gb, buf, buf_size * 8);
77 if (get_bits(&gb, 4) != 0xd)
78 av_log(avctx, AV_LOG_WARNING, "Missing GSM magic!\n");
79 res = gsm_decode_block(avctx, samples, &gb);
84 res = ff_msgsm_decode_block(avctx, samples, buf);
88 *data_size = frame_bytes;
89 return avctx->block_align;
92 static void gsm_flush(AVCodecContext *avctx)
94 GSMContext *s = avctx->priv_data;
95 memset(s, 0, sizeof(*s));
98 AVCodec ff_gsm_decoder = {
100 .type = AVMEDIA_TYPE_AUDIO,
102 .priv_data_size = sizeof(GSMContext),
104 .decode = gsm_decode_frame,
106 .long_name = NULL_IF_CONFIG_SMALL("GSM"),
109 AVCodec ff_gsm_ms_decoder = {
111 .type = AVMEDIA_TYPE_AUDIO,
112 .id = CODEC_ID_GSM_MS,
113 .priv_data_size = sizeof(GSMContext),
115 .decode = gsm_decode_frame,
117 .long_name = NULL_IF_CONFIG_SMALL("GSM Microsoft variant"),