// The idiosyncrasies of GSM-in-WAV are explained at http://kbs.cs.tu-berlin.de/~jutta/toast.html
-#include "avcodec.h"
#include <gsm/gsm.h>
-// gsm.h misses some essential constants
-#define GSM_BLOCK_SIZE 33
-#define GSM_MS_BLOCK_SIZE 65
-#define GSM_FRAME_SIZE 160
+#include "avcodec.h"
+#include "gsm.h"
-static av_cold int libgsm_init(AVCodecContext *avctx) {
+static av_cold int libgsm_encode_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 = AV_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_UNOFFICIAL)
- 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_UNOFFICIAL)
- return -1;
- }
+ 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_UNOFFICIAL)
+ 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_UNOFFICIAL)
+ return -1;
}
avctx->priv_data = gsm_create();
return 0;
}
-static av_cold int libgsm_close(AVCodecContext *avctx) {
+static av_cold int libgsm_encode_close(AVCodecContext *avctx) {
av_freep(&avctx->coded_frame);
gsm_destroy(avctx->priv_data);
avctx->priv_data = NULL;
AVCodec ff_libgsm_encoder = {
- "libgsm",
- AVMEDIA_TYPE_AUDIO,
- CODEC_ID_GSM,
- 0,
- libgsm_init,
- libgsm_encode_frame,
- libgsm_close,
+ .name = "libgsm",
+ .type = AVMEDIA_TYPE_AUDIO,
+ .id = CODEC_ID_GSM,
+ .init = libgsm_encode_init,
+ .encode = libgsm_encode_frame,
+ .close = libgsm_encode_close,
.sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
.long_name = NULL_IF_CONFIG_SMALL("libgsm GSM"),
};
AVCodec ff_libgsm_ms_encoder = {
- "libgsm_ms",
- AVMEDIA_TYPE_AUDIO,
- CODEC_ID_GSM_MS,
- 0,
- libgsm_init,
- libgsm_encode_frame,
- libgsm_close,
+ .name = "libgsm_ms",
+ .type = AVMEDIA_TYPE_AUDIO,
+ .id = CODEC_ID_GSM_MS,
+ .init = libgsm_encode_init,
+ .encode = libgsm_encode_frame,
+ .close = libgsm_encode_close,
.sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_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,
- AVPacket *avpkt) {
- 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;
+typedef struct LibGSMDecodeContext {
+ AVFrame frame;
+ struct gsm_state *state;
+} LibGSMDecodeContext;
+
+static av_cold int libgsm_decode_init(AVCodecContext *avctx) {
+ LibGSMDecodeContext *s = avctx->priv_data;
+
+ if (avctx->channels > 1) {
+ av_log(avctx, AV_LOG_ERROR, "Mono required for GSM, got %d channels\n",
+ avctx->channels);
+ return -1;
+ }
+
+ if (!avctx->channels)
+ avctx->channels = 1;
+
+ if (!avctx->sample_rate)
+ avctx->sample_rate = 8000;
+
+ avctx->sample_fmt = AV_SAMPLE_FMT_S16;
+
+ s->state = gsm_create();
+
switch(avctx->codec_id) {
case CODEC_ID_GSM:
- if(gsm_decode(avctx->priv_data,buf,data)) return -1;
- *data_size = GSM_FRAME_SIZE*sizeof(int16_t);
+ avctx->frame_size = GSM_FRAME_SIZE;
+ avctx->block_align = GSM_BLOCK_SIZE;
break;
- case CODEC_ID_GSM_MS:
- if(gsm_decode(avctx->priv_data,buf,data) ||
- gsm_decode(avctx->priv_data,buf+33,((int16_t*)data)+GSM_FRAME_SIZE)) return -1;
- *data_size = GSM_FRAME_SIZE*sizeof(int16_t)*2;
+ case CODEC_ID_GSM_MS: {
+ int one = 1;
+ gsm_option(s->state, GSM_OPT_WAV49, &one);
+ avctx->frame_size = 2 * GSM_FRAME_SIZE;
+ avctx->block_align = GSM_MS_BLOCK_SIZE;
+ }
+ }
+
+ avcodec_get_frame_defaults(&s->frame);
+ avctx->coded_frame = &s->frame;
+
+ return 0;
+}
+
+static av_cold int libgsm_decode_close(AVCodecContext *avctx) {
+ LibGSMDecodeContext *s = avctx->priv_data;
+
+ gsm_destroy(s->state);
+ s->state = NULL;
+ return 0;
+}
+
+static int libgsm_decode_frame(AVCodecContext *avctx, void *data,
+ int *got_frame_ptr, AVPacket *avpkt)
+{
+ int i, ret;
+ LibGSMDecodeContext *s = avctx->priv_data;
+ uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->size;
+ int16_t *samples;
+
+ if (buf_size < avctx->block_align) {
+ av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ /* get output buffer */
+ s->frame.nb_samples = avctx->frame_size;
+ if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
+ av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+ return ret;
+ }
+ samples = (int16_t *)s->frame.data[0];
+
+ for (i = 0; i < avctx->frame_size / GSM_FRAME_SIZE; i++) {
+ if ((ret = gsm_decode(s->state, buf, samples)) < 0)
+ return -1;
+ buf += GSM_BLOCK_SIZE;
+ samples += GSM_FRAME_SIZE;
}
+
+ *got_frame_ptr = 1;
+ *(AVFrame *)data = s->frame;
+
return avctx->block_align;
}
+static void libgsm_flush(AVCodecContext *avctx) {
+ LibGSMDecodeContext *s = avctx->priv_data;
+ int one = 1;
+
+ gsm_destroy(s->state);
+ s->state = gsm_create();
+ if (avctx->codec_id == CODEC_ID_GSM_MS)
+ gsm_option(s->state, GSM_OPT_WAV49, &one);
+}
+
AVCodec ff_libgsm_decoder = {
- "libgsm",
- AVMEDIA_TYPE_AUDIO,
- CODEC_ID_GSM,
- 0,
- libgsm_init,
- NULL,
- libgsm_close,
- libgsm_decode_frame,
+ .name = "libgsm",
+ .type = AVMEDIA_TYPE_AUDIO,
+ .id = CODEC_ID_GSM,
+ .priv_data_size = sizeof(LibGSMDecodeContext),
+ .init = libgsm_decode_init,
+ .close = libgsm_decode_close,
+ .decode = libgsm_decode_frame,
+ .flush = libgsm_flush,
+ .capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("libgsm GSM"),
};
AVCodec ff_libgsm_ms_decoder = {
- "libgsm_ms",
- AVMEDIA_TYPE_AUDIO,
- CODEC_ID_GSM_MS,
- 0,
- libgsm_init,
- NULL,
- libgsm_close,
- libgsm_decode_frame,
+ .name = "libgsm_ms",
+ .type = AVMEDIA_TYPE_AUDIO,
+ .id = CODEC_ID_GSM_MS,
+ .priv_data_size = sizeof(LibGSMDecodeContext),
+ .init = libgsm_decode_init,
+ .close = libgsm_decode_close,
+ .decode = libgsm_decode_frame,
+ .flush = libgsm_flush,
+ .capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("libgsm GSM Microsoft variant"),
};
projects / ffmpeg / blobdiff