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)
35 GSMContext *s = avctx->priv_data;
38 if (!avctx->sample_rate)
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;
48 avctx->frame_size = 2 * GSM_FRAME_SIZE;
49 avctx->block_align = GSM_MS_BLOCK_SIZE;
52 avcodec_get_frame_defaults(&s->frame);
53 avctx->coded_frame = &s->frame;
58 static int gsm_decode_frame(AVCodecContext *avctx, void *data,
59 int *got_frame_ptr, AVPacket *avpkt)
61 GSMContext *s = avctx->priv_data;
64 const uint8_t *buf = avpkt->data;
65 int buf_size = avpkt->size;
68 if (buf_size < avctx->block_align) {
69 av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
70 return AVERROR_INVALIDDATA;
73 /* get output buffer */
74 s->frame.nb_samples = avctx->frame_size;
75 if ((res = avctx->get_buffer(avctx, &s->frame)) < 0) {
76 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
79 samples = (int16_t *)s->frame.data[0];
81 switch (avctx->codec_id) {
83 init_get_bits(&gb, buf, buf_size * 8);
84 if (get_bits(&gb, 4) != 0xd)
85 av_log(avctx, AV_LOG_WARNING, "Missing GSM magic!\n");
86 res = gsm_decode_block(avctx, samples, &gb);
91 res = ff_msgsm_decode_block(avctx, samples, buf);
97 *(AVFrame *)data = s->frame;
99 return avctx->block_align;
102 static void gsm_flush(AVCodecContext *avctx)
104 GSMContext *s = avctx->priv_data;
105 memset(s, 0, sizeof(*s));
108 AVCodec ff_gsm_decoder = {
110 .type = AVMEDIA_TYPE_AUDIO,
112 .priv_data_size = sizeof(GSMContext),
114 .decode = gsm_decode_frame,
116 .capabilities = CODEC_CAP_DR1,
117 .long_name = NULL_IF_CONFIG_SMALL("GSM"),
120 AVCodec ff_gsm_ms_decoder = {
122 .type = AVMEDIA_TYPE_AUDIO,
123 .id = CODEC_ID_GSM_MS,
124 .priv_data_size = sizeof(GSMContext),
126 .decode = gsm_decode_frame,
128 .capabilities = CODEC_CAP_DR1,
129 .long_name = NULL_IF_CONFIG_SMALL("GSM Microsoft variant"),