*/
#include <stdint.h>
+
+#include "libavutil/channel_layout.h"
+#include "libavutil/common.h"
#include "libavutil/intreadwrite.h"
#include "avcodec.h"
+#include "internal.h"
/**
* @file
- * Westwood SNDx codecs.
+ * Westwood SNDx codecs
*
* Reference documents about VQA format and its audio codecs
* can be found here:
* http://www.multimedia.cx
*/
-static const int8_t ws_adpcm_2bit[] = { -2, -1, 0, 1};
static const int8_t ws_adpcm_4bit[] = {
-9, -8, -6, -5, -4, -3, -2, -1,
- 0, 1, 2, 3, 4, 5, 6, 8 };
+ 0, 1, 2, 3, 4, 5, 6, 8
+};
-static av_cold int ws_snd_decode_init(AVCodecContext * avctx)
+static av_cold int ws_snd_decode_init(AVCodecContext *avctx)
{
-// WSSNDContext *c = avctx->priv_data;
-
- if (avctx->channels != 1) {
- av_log_ask_for_sample(avctx, "unsupported number of channels\n");
- return AVERROR(EINVAL);
- }
+ avctx->channels = 1;
+ avctx->channel_layout = AV_CH_LAYOUT_MONO;
+ avctx->sample_fmt = AV_SAMPLE_FMT_U8;
- avctx->sample_fmt = AV_SAMPLE_FMT_U8;
return 0;
}
-static int ws_snd_decode_frame(AVCodecContext *avctx,
- void *data, int *data_size,
- AVPacket *avpkt)
+static int ws_snd_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;
-// WSSNDContext *c = avctx->priv_data;
+ int buf_size = avpkt->size;
- int in_size, out_size;
+ int in_size, out_size, ret;
int sample = 128;
- uint8_t *samples = data;
+ uint8_t *samples;
uint8_t *samples_end;
if (!buf_size)
}
out_size = AV_RL16(&buf[0]);
- in_size = AV_RL16(&buf[2]);
+ in_size = AV_RL16(&buf[2]);
buf += 4;
- if (out_size > *data_size) {
- av_log(avctx, AV_LOG_ERROR, "Frame is too large to fit in buffer\n");
- return -1;
- }
if (in_size > buf_size) {
av_log(avctx, AV_LOG_ERROR, "Frame data is larger than input buffer\n");
return -1;
}
+
+ /* get output buffer */
+ frame->nb_samples = out_size;
+ if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
+ av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+ return ret;
+ }
+ samples = frame->data[0];
samples_end = samples + out_size;
if (in_size == out_size) {
memcpy(samples, buf, out_size);
- *data_size = out_size;
+ *got_frame_ptr = 1;
return buf_size;
}
while (samples < samples_end && buf - avpkt->data < buf_size) {
int code, smp, size;
uint8_t count;
- code = (*buf) >> 6;
- count = (*buf) & 0x3F;
+ code = *buf >> 6;
+ count = *buf & 0x3F;
buf++;
/* make sure we don't write past the output buffer */
switch (code) {
- case 0: smp = 4; break;
- case 1: smp = 2; break;
+ case 0: smp = 4 * (count + 1); break;
+ case 1: smp = 2 * (count + 1); break;
case 2: smp = (count & 0x20) ? 1 : count + 1; break;
default: smp = count + 1; break;
}
if ((buf - avpkt->data) + size > buf_size)
break;
- switch(code) {
+ switch (code) {
case 0: /* ADPCM 2-bit */
for (count++; count > 0; count--) {
code = *buf++;
- sample += ws_adpcm_2bit[code & 0x3];
+ sample += ( code & 0x3) - 2;
sample = av_clip_uint8(sample);
*samples++ = sample;
- sample += ws_adpcm_2bit[(code >> 2) & 0x3];
+ sample += ((code >> 2) & 0x3) - 2;
sample = av_clip_uint8(sample);
*samples++ = sample;
- sample += ws_adpcm_2bit[(code >> 4) & 0x3];
+ sample += ((code >> 4) & 0x3) - 2;
sample = av_clip_uint8(sample);
*samples++ = sample;
- sample += ws_adpcm_2bit[(code >> 6) & 0x3];
+ sample += (code >> 6) - 2;
sample = av_clip_uint8(sample);
*samples++ = sample;
}
}
}
- *data_size = samples - (uint8_t *)data;
+ frame->nb_samples = samples - frame->data[0];
+ *got_frame_ptr = 1;
return buf_size;
}
AVCodec ff_ws_snd1_decoder = {
.name = "ws_snd1",
+ .long_name = NULL_IF_CONFIG_SMALL("Westwood Audio (SND1)"),
.type = AVMEDIA_TYPE_AUDIO,
- .id = CODEC_ID_WESTWOOD_SND1,
+ .id = AV_CODEC_ID_WESTWOOD_SND1,
.init = ws_snd_decode_init,
.decode = ws_snd_decode_frame,
- .long_name = NULL_IF_CONFIG_SMALL("Westwood Audio (SND1)"),
+ .capabilities = AV_CODEC_CAP_DR1,
};