#define FREEZE_INTERVAL 128
+/* This is an arbitrary value. Allowing insanely large values leads to strange
+ problems, so we limit it to a reasonable value */
+#define MAX_FRAME_SIZE 32768
+
+/* We clip the value of avctx->trellis to prevent data type overflows and
+ undefined behavior. Using larger values is insanely slow anyway. */
+#define MIN_TRELLIS 0
+#define MAX_TRELLIS 16
+
static av_cold int g722_encode_init(AVCodecContext * avctx)
{
G722Context *c = avctx->priv_data;
}
}
+ if (avctx->frame_size) {
+ /* validate frame size */
+ if (avctx->frame_size & 1 || avctx->frame_size > MAX_FRAME_SIZE) {
+ int new_frame_size;
+
+ if (avctx->frame_size == 1)
+ new_frame_size = 2;
+ else if (avctx->frame_size > MAX_FRAME_SIZE)
+ new_frame_size = MAX_FRAME_SIZE;
+ else
+ new_frame_size = avctx->frame_size - 1;
+
+ av_log(avctx, AV_LOG_WARNING, "Requested frame size is not "
+ "allowed. Using %d instead of %d\n", new_frame_size,
+ avctx->frame_size);
+ avctx->frame_size = new_frame_size;
+ }
+ } else {
+ /* This is arbitrary. We use 320 because it's 20ms @ 16kHz, which is
+ a common packet size for VoIP applications */
+ avctx->frame_size = 320;
+ }
+
+ if (avctx->trellis) {
+ /* validate trellis */
+ if (avctx->trellis < MIN_TRELLIS || avctx->trellis > MAX_TRELLIS) {
+ int new_trellis = av_clip(avctx->trellis, MIN_TRELLIS, MAX_TRELLIS);
+ av_log(avctx, AV_LOG_WARNING, "Requested trellis value is not "
+ "allowed. Using %d instead of %d\n", new_trellis,
+ avctx->trellis);
+ avctx->trellis = new_trellis;
+ }
+ }
+
return 0;
}
return (diff < 0 ? (i < 2 ? 63 : 33) : 61) - i;
}
-static int g722_encode_trellis(AVCodecContext *avctx,
- uint8_t *dst, int buf_size, void *data)
+static void g722_encode_trellis(G722Context *c, int trellis,
+ uint8_t *dst, int nb_samples,
+ const int16_t *samples)
{
- G722Context *c = avctx->priv_data;
- const int16_t *samples = data;
int i, j, k;
- int frontier = 1 << avctx->trellis;
+ int frontier = 1 << trellis;
struct TrellisNode **nodes[2];
struct TrellisNode **nodes_next[2];
int pathn[2] = {0, 0}, froze = -1;
nodes[i][0]->state = c->band[i];
}
- for (i = 0; i < buf_size; i++) {
+ for (i = 0; i < nb_samples >> 1; i++) {
int xlow, xhigh;
struct TrellisNode *next[2];
int heap_pos[2] = {0, 0};
for (j = 0; j < frontier && nodes[0][j]; j++) {
/* Only k >> 2 affects the future adaptive state, therefore testing
- * small steps that don't change k >> 2 is useless, the orignal
+ * small steps that don't change k >> 2 is useless, the original
* value from encode_low is better than them. Since we step k
* in steps of 4, make sure range is a multiple of 4, so that
* we don't miss the original value from encode_low. */
}
c->band[0] = nodes[0][0]->state;
c->band[1] = nodes[1][0]->state;
+}
+
+static av_always_inline void encode_byte(G722Context *c, uint8_t *dst,
+ const int16_t *samples)
+{
+ int xlow, xhigh, ilow, ihigh;
+ filter_samples(c, samples, &xlow, &xhigh);
+ ihigh = encode_high(&c->band[1], xhigh);
+ ilow = encode_low (&c->band[0], xlow);
+ ff_g722_update_high_predictor(&c->band[1], c->band[1].scale_factor *
+ ff_g722_high_inv_quant[ihigh] >> 10, ihigh);
+ ff_g722_update_low_predictor(&c->band[0], ilow >> 2);
+ *dst = ihigh << 6 | ilow;
+}
- return i;
+static void g722_encode_no_trellis(G722Context *c,
+ uint8_t *dst, int nb_samples,
+ const int16_t *samples)
+{
+ int i;
+ for (i = 0; i < nb_samples; i += 2)
+ encode_byte(c, dst++, &samples[i]);
}
static int g722_encode_frame(AVCodecContext *avctx,
{
G722Context *c = avctx->priv_data;
const int16_t *samples = data;
- int i;
+ int nb_samples;
- if (avctx->trellis)
- return g722_encode_trellis(avctx, dst, buf_size, data);
+ nb_samples = avctx->frame_size - (avctx->frame_size & 1);
- for (i = 0; i < buf_size; i++) {
- int xlow, xhigh, ihigh, ilow;
- filter_samples(c, &samples[2*i], &xlow, &xhigh);
- ihigh = encode_high(&c->band[1], xhigh);
- ilow = encode_low(&c->band[0], xlow);
- ff_g722_update_high_predictor(&c->band[1], c->band[1].scale_factor *
- ff_g722_high_inv_quant[ihigh] >> 10, ihigh);
- ff_g722_update_low_predictor(&c->band[0], ilow >> 2);
- *dst++ = ihigh << 6 | ilow;
+ if (avctx->trellis)
+ g722_encode_trellis(c, avctx->trellis, dst, nb_samples, samples);
+ else
+ g722_encode_no_trellis(c, dst, nb_samples, samples);
+
+ /* handle last frame with odd frame_size */
+ if (nb_samples < avctx->frame_size) {
+ int16_t last_samples[2] = { samples[nb_samples], samples[nb_samples] };
+ encode_byte(c, &dst[nb_samples >> 1], last_samples);
}
- return i;
+
+ return (avctx->frame_size + 1) >> 1;
}
AVCodec ff_adpcm_g722_encoder = {
.init = g722_encode_init,
.close = g722_encode_close,
.encode = g722_encode_frame,
+ .capabilities = CODEC_CAP_SMALL_LAST_FRAME,
.long_name = NULL_IF_CONFIG_SMALL("G.722 ADPCM"),
.sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
};
projects / ffmpeg / blobdiff