*/
/**
- * @file libgsm.c
+ * @file
* Interface to libgsm for gsm encoding/decoding
*/
// The idiosyncrasies of GSM-in-WAV are explained at http://kbs.cs.tu-berlin.de/~jutta/toast.html
#include "avcodec.h"
-#include <gsm.h>
+#include <gsm/gsm.h>
-// gsm.h miss some essential constants
+// gsm.h misses some essential constants
#define GSM_BLOCK_SIZE 33
#define GSM_MS_BLOCK_SIZE 65
#define GSM_FRAME_SIZE 160
-static int libgsm_init(AVCodecContext *avctx) {
- if (avctx->channels > 1 || avctx->sample_rate != 8000 || avctx->bit_rate != 13000)
+static av_cold int libgsm_init(AVCodecContext *avctx) {
+ if (avctx->channels > 1) {
+ av_log(avctx, AV_LOG_ERROR, "Mono required for GSM, got %d channels\n",
+ avctx->channels);
return -1;
+ }
+
+ if(avctx->codec->decode){
+ if(!avctx->channels)
+ avctx->channels= 1;
+
+ if(!avctx->sample_rate)
+ avctx->sample_rate= 8000;
+
+ avctx->sample_fmt = SAMPLE_FMT_S16;
+ }else{
+ if (avctx->sample_rate != 8000) {
+ av_log(avctx, AV_LOG_ERROR, "Sample rate 8000Hz required for GSM, got %dHz\n",
+ avctx->sample_rate);
+ if(avctx->strict_std_compliance > FF_COMPLIANCE_INOFFICIAL)
+ return -1;
+ }
+ if (avctx->bit_rate != 13000 /* Official */ &&
+ avctx->bit_rate != 13200 /* Very common */ &&
+ avctx->bit_rate != 0 /* Unknown; a.o. mov does not set bitrate when decoding */ ) {
+ av_log(avctx, AV_LOG_ERROR, "Bitrate 13000bps required for GSM, got %dbps\n",
+ avctx->bit_rate);
+ if(avctx->strict_std_compliance > FF_COMPLIANCE_INOFFICIAL)
+ return -1;
+ }
+ }
avctx->priv_data = gsm_create();
return 0;
}
-static int libgsm_close(AVCodecContext *avctx) {
+static av_cold int libgsm_close(AVCodecContext *avctx) {
+ av_freep(&avctx->coded_frame);
gsm_destroy(avctx->priv_data);
avctx->priv_data = NULL;
return 0;
AVCodec libgsm_encoder = {
"libgsm",
- CODEC_TYPE_AUDIO,
+ AVMEDIA_TYPE_AUDIO,
CODEC_ID_GSM,
0,
libgsm_init,
libgsm_encode_frame,
libgsm_close,
+ .sample_fmts = (const enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
+ .long_name = NULL_IF_CONFIG_SMALL("libgsm GSM"),
};
AVCodec libgsm_ms_encoder = {
"libgsm_ms",
- CODEC_TYPE_AUDIO,
+ AVMEDIA_TYPE_AUDIO,
CODEC_ID_GSM_MS,
0,
libgsm_init,
libgsm_encode_frame,
libgsm_close,
+ .sample_fmts = (const enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
+ .long_name = NULL_IF_CONFIG_SMALL("libgsm GSM Microsoft variant"),
};
static int libgsm_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
- uint8_t *buf, int buf_size) {
-
- if(buf_size < avctx->block_align) return 0;
-
+ AVPacket *avpkt) {
+ const uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->size;
+ *data_size = 0; /* In case of error */
+ if(buf_size < avctx->block_align) return -1;
switch(avctx->codec_id) {
case CODEC_ID_GSM:
if(gsm_decode(avctx->priv_data,buf,data)) return -1;
AVCodec libgsm_decoder = {
"libgsm",
- CODEC_TYPE_AUDIO,
+ AVMEDIA_TYPE_AUDIO,
CODEC_ID_GSM,
0,
libgsm_init,
NULL,
libgsm_close,
libgsm_decode_frame,
+ .long_name = NULL_IF_CONFIG_SMALL("libgsm GSM"),
};
AVCodec libgsm_ms_decoder = {
"libgsm_ms",
- CODEC_TYPE_AUDIO,
+ AVMEDIA_TYPE_AUDIO,
CODEC_ID_GSM_MS,
0,
libgsm_init,
NULL,
libgsm_close,
libgsm_decode_frame,
+ .long_name = NULL_IF_CONFIG_SMALL("libgsm GSM Microsoft variant"),
};