* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <limits.h>
+
#include "libavutil/avassert.h"
+#include "libavutil/channel_layout.h"
+#include "libavutil/opt.h"
#include "avcodec.h"
+#include "internal.h"
#include "get_bits.h"
#include "put_bits.h"
/**
* G.726 11bit float.
* G.726 Standard uses rather odd 11bit floating point arithmentic for
- * numerous occasions. It's a mistery to me why they did it this way
+ * numerous occasions. It's a mystery to me why they did it this way
* instead of simply using 32bit integer arithmetic.
*/
typedef struct Float11 {
} G726Tables;
typedef struct G726Context {
+ AVClass *class;
G726Tables tbls; /**< static tables needed for computation */
Float11 sr[2]; /**< prev. reconstructed samples */
c->b[i] = 0;
} else {
/* This is a bit crazy, but it really is +255 not +256 */
- fa1 = av_clip((-c->a[0]*c->pk[0]*pk0)>>5, -256, 255);
+ fa1 = av_clip_intp2((-c->a[0]*c->pk[0]*pk0)>>5, 8);
c->a[1] += 128*pk0*c->pk[1] + fa1 - (c->a[1]>>7);
c->a[1] = av_clip(c->a[1], -12288, 12288);
return av_clip(re_signal << 2, -0xffff, 0xffff);
}
-static av_cold int g726_reset(G726Context* c, int index)
+static av_cold int g726_reset(G726Context *c)
{
int i;
- c->tbls = G726Tables_pool[index];
+ c->tbls = G726Tables_pool[c->code_size - 2];
for (i=0; i<2; i++) {
c->sr[i].mant = 1<<5;
c->pk[i] = 1;
return AVERROR(EINVAL);
}
- if (avctx->bit_rate % avctx->sample_rate) {
- av_log(avctx, AV_LOG_ERROR, "Bitrate - Samplerate combination is invalid\n");
- return AVERROR(EINVAL);
- }
- c->code_size = (avctx->bit_rate + avctx->sample_rate/2) / avctx->sample_rate;
- if (c->code_size < 2 || c->code_size > 5) {
- av_log(avctx, AV_LOG_ERROR, "Invalid number of bits %d\n", c->code_size);
- return AVERROR(EINVAL);
- }
- avctx->bits_per_coded_sample = c->code_size;
+ if (avctx->bit_rate)
+ c->code_size = (avctx->bit_rate + avctx->sample_rate/2) / avctx->sample_rate;
- g726_reset(c, c->code_size - 2);
+ c->code_size = av_clip(c->code_size, 2, 5);
+ avctx->bit_rate = c->code_size * avctx->sample_rate;
+ avctx->bits_per_coded_sample = c->code_size;
- avctx->coded_frame = avcodec_alloc_frame();
- if (!avctx->coded_frame)
- return AVERROR(ENOMEM);
- avctx->coded_frame->key_frame = 1;
+ g726_reset(c);
/* select a frame size that will end on a byte boundary and have a size of
approximately 1024 bytes */
return 0;
}
-static av_cold int g726_encode_close(AVCodecContext *avctx)
-{
- av_freep(&avctx->coded_frame);
- return 0;
-}
-
-static int g726_encode_frame(AVCodecContext *avctx,
- uint8_t *dst, int buf_size, void *data)
+static int g726_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
+ const AVFrame *frame, int *got_packet_ptr)
{
G726Context *c = avctx->priv_data;
- const int16_t *samples = data;
+ const int16_t *samples = (const int16_t *)frame->data[0];
PutBitContext pb;
- int i;
+ int i, ret, out_size;
- init_put_bits(&pb, dst, 1024*1024);
+ out_size = (frame->nb_samples * c->code_size + 7) / 8;
+ if ((ret = ff_alloc_packet(avpkt, out_size))) {
+ av_log(avctx, AV_LOG_ERROR, "Error getting output packet\n");
+ return ret;
+ }
+ init_put_bits(&pb, avpkt->data, avpkt->size);
- for (i = 0; i < avctx->frame_size; i++)
+ for (i = 0; i < frame->nb_samples; i++)
put_bits(&pb, c->code_size, g726_encode(c, *samples++));
flush_put_bits(&pb);
- return put_bits_count(&pb)>>3;
+ avpkt->size = out_size;
+ *got_packet_ptr = 1;
+ return 0;
}
+#define OFFSET(x) offsetof(G726Context, x)
+#define AE AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
+static const AVOption options[] = {
+ { "code_size", "Bits per code", OFFSET(code_size), AV_OPT_TYPE_INT, { .i64 = 4 }, 2, 5, AE },
+ { NULL },
+};
+
+static const AVClass class = {
+ .class_name = "g726",
+ .item_name = av_default_item_name,
+ .option = options,
+ .version = LIBAVUTIL_VERSION_INT,
+};
+
+static const AVCodecDefault defaults[] = {
+ { "b", "0" },
+ { NULL },
+};
+
AVCodec ff_adpcm_g726_encoder = {
.name = "g726",
+ .long_name = NULL_IF_CONFIG_SMALL("G.726 ADPCM"),
.type = AVMEDIA_TYPE_AUDIO,
- .id = CODEC_ID_ADPCM_G726,
+ .id = AV_CODEC_ID_ADPCM_G726,
.priv_data_size = sizeof(G726Context),
.init = g726_encode_init,
- .encode = g726_encode_frame,
- .close = g726_encode_close,
- .capabilities = CODEC_CAP_SMALL_LAST_FRAME,
- .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
- .long_name = NULL_IF_CONFIG_SMALL("G.726 ADPCM"),
+ .encode2 = g726_encode_frame,
+ .capabilities = CODEC_CAP_SMALL_LAST_FRAME,
+ .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
+ AV_SAMPLE_FMT_NONE },
+ .priv_class = &class,
+ .defaults = defaults,
};
#endif
{
G726Context* c = avctx->priv_data;
- if (avctx->strict_std_compliance >= FF_COMPLIANCE_STRICT &&
- avctx->sample_rate != 8000) {
- av_log(avctx, AV_LOG_ERROR, "Only 8kHz sample rate is allowed when "
- "the compliance level is strict. Reduce the compliance level "
- "if you wish to decode the stream anyway.\n");
- return AVERROR(EINVAL);
- }
-
- if(avctx->channels != 1){
- av_log(avctx, AV_LOG_ERROR, "Only mono is supported\n");
- return AVERROR(EINVAL);
- }
+ avctx->channels = 1;
+ avctx->channel_layout = AV_CH_LAYOUT_MONO;
c->code_size = avctx->bits_per_coded_sample;
if (c->code_size < 2 || c->code_size > 5) {
av_log(avctx, AV_LOG_ERROR, "Invalid number of bits %d\n", c->code_size);
return AVERROR(EINVAL);
}
- g726_reset(c, c->code_size - 2);
+ g726_reset(c);
avctx->sample_fmt = AV_SAMPLE_FMT_S16;
return 0;
}
-static int g726_decode_frame(AVCodecContext *avctx,
- void *data, int *data_size,
- AVPacket *avpkt)
+static int g726_decode_frame(AVCodecContext *avctx, void *data,
+ int *got_frame_ptr, AVPacket *avpkt)
{
+ AVFrame *frame = data;
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
G726Context *c = avctx->priv_data;
- int16_t *samples = data;
+ int16_t *samples;
GetBitContext gb;
- int out_samples, out_size;
+ int out_samples, ret;
out_samples = buf_size * 8 / c->code_size;
- out_size = out_samples * av_get_bytes_per_sample(avctx->sample_fmt);
- if (*data_size < out_size) {
- av_log(avctx, AV_LOG_ERROR, "Output buffer is too small\n");
- return AVERROR(EINVAL);
+
+ /* get output buffer */
+ frame->nb_samples = out_samples;
+ if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
+ av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+ return ret;
}
+ samples = (int16_t *)frame->data[0];
init_get_bits(&gb, buf, buf_size * 8);
if (get_bits_left(&gb) > 0)
av_log(avctx, AV_LOG_ERROR, "Frame invalidly split, missing parser?\n");
- *data_size = out_size;
+ *got_frame_ptr = 1;
+
return buf_size;
}
+static void g726_decode_flush(AVCodecContext *avctx)
+{
+ G726Context *c = avctx->priv_data;
+ g726_reset(c);
+}
+
AVCodec ff_adpcm_g726_decoder = {
.name = "g726",
+ .long_name = NULL_IF_CONFIG_SMALL("G.726 ADPCM"),
.type = AVMEDIA_TYPE_AUDIO,
- .id = CODEC_ID_ADPCM_G726,
+ .id = AV_CODEC_ID_ADPCM_G726,
.priv_data_size = sizeof(G726Context),
.init = g726_decode_init,
.decode = g726_decode_frame,
- .long_name = NULL_IF_CONFIG_SMALL("G.726 ADPCM"),
+ .flush = g726_decode_flush,
+ .capabilities = CODEC_CAP_DR1,
};
#endif
projects / ffmpeg / blobdiff