ffmpeg: check samplerate from decoder.

[ffmpeg] / libavcodec / g722dec.c

diff --git a/libavcodec/g722dec.c b/libavcodec/g722dec.c
index 51f87c9d3c1c4419f8010780cfec7ef2fcd521c3..72bb0ef3c784d15008ce64984619e9f9e6590d49 100644 (file)
--- a/libavcodec/g722dec.c
+++ b/libavcodec/g722dec.c
@@ -37,6 +37,21 @@
 #include "avcodec.h"
 #include "get_bits.h"
 #include "g722.h"
+#include "libavutil/opt.h"
+
+#define OFFSET(x) offsetof(G722Context, x)
+#define AD AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_DECODING_PARAM
+static const AVOption options[] = {
+    { "bits_per_codeword", "Bits per G722 codeword", OFFSET(bits_per_codeword), AV_OPT_TYPE_FLAGS, { 8 }, 6, 8, AD },
+    { NULL }
+};
+
+static const AVClass g722_decoder_class = {
+    .class_name = "g722 decoder",
+    .item_name  = av_default_item_name,
+    .option     = options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
 
 static av_cold int g722_decode_init(AVCodecContext * avctx)
 {
@@ -48,26 +63,12 @@ static av_cold int g722_decode_init(AVCodecContext * avctx)
     }
     avctx->sample_fmt = AV_SAMPLE_FMT_S16;
 
-    switch (avctx->bits_per_coded_sample) {
-    case 8:
-    case 7:
-    case 6:
-        break;
-    default:
-        av_log(avctx, AV_LOG_WARNING, "Unsupported bits_per_coded_sample [%d], "
-                                      "assuming 8\n",
-                                      avctx->bits_per_coded_sample);
-    case 0:
-        avctx->bits_per_coded_sample = 8;
-        break;
-    }
-
     c->band[0].scale_factor = 8;
     c->band[1].scale_factor = 2;
     c->prev_samples_pos = 22;
 
-    if (avctx->lowres)
-        avctx->sample_rate /= 2;
+    avcodec_get_frame_defaults(&c->frame);
+    avctx->coded_frame = &c->frame;
 
     return 0;
 }
@@ -84,19 +85,28 @@ static const int16_t *low_inv_quants[3] = { ff_g722_low_inv_quant6,
                                             ff_g722_low_inv_quant4 };
 
 static int g722_decode_frame(AVCodecContext *avctx, void *data,
-                             int *data_size, AVPacket *avpkt)
+                             int *got_frame_ptr, AVPacket *avpkt)
 {
     G722Context *c = avctx->priv_data;
-    int16_t *out_buf = data;
-    int j, out_len = 0;
-    const int skip = 8 - avctx->bits_per_coded_sample;
+    int16_t *out_buf;
+    int j, ret;
+    const int skip = 8 - c->bits_per_codeword;
     const int16_t *quantizer_table = low_inv_quants[skip];
     GetBitContext gb;
 
+    /* get output buffer */
+    c->frame.nb_samples = avpkt->size * 2;
+    if ((ret = avctx->get_buffer(avctx, &c->frame)) < 0) {
+        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+        return ret;
+    }
+    out_buf = (int16_t *)c->frame.data[0];
+
     init_get_bits(&gb, avpkt->data, avpkt->size * 8);
 
     for (j = 0; j < avpkt->size; j++) {
-        int ilow, ihigh, rlow;
+        int ilow, ihigh, rlow, rhigh, dhigh;
+        int xout1, xout2;
 
         ihigh = get_bits(&gb, 2);
         ilow = get_bits(&gb, 6 - skip);
@@ -107,31 +117,27 @@ static int g722_decode_frame(AVCodecContext *avctx, void *data,
 
         ff_g722_update_low_predictor(&c->band[0], ilow >> (2 - skip));
 
-        if (!avctx->lowres) {
-            const int dhigh = c->band[1].scale_factor *
-                              ff_g722_high_inv_quant[ihigh] >> 10;
-            const int rhigh = av_clip(dhigh + c->band[1].s_predictor,
-                                      -16384, 16383);
-            int xout1, xout2;
-
-            ff_g722_update_high_predictor(&c->band[1], dhigh, ihigh);
-
-            c->prev_samples[c->prev_samples_pos++] = rlow + rhigh;
-            c->prev_samples[c->prev_samples_pos++] = rlow - rhigh;
-            ff_g722_apply_qmf(c->prev_samples + c->prev_samples_pos - 24,
-                              &xout1, &xout2);
-            out_buf[out_len++] = av_clip_int16(xout1 >> 12);
-            out_buf[out_len++] = av_clip_int16(xout2 >> 12);
-            if (c->prev_samples_pos >= PREV_SAMPLES_BUF_SIZE) {
-                memmove(c->prev_samples,
-                        c->prev_samples + c->prev_samples_pos - 22,
-                        22 * sizeof(c->prev_samples[0]));
-                c->prev_samples_pos = 22;
-            }
-        } else
-            out_buf[out_len++] = rlow;
+        dhigh = c->band[1].scale_factor * ff_g722_high_inv_quant[ihigh] >> 10;
+        rhigh = av_clip(dhigh + c->band[1].s_predictor, -16384, 16383);
+
+        ff_g722_update_high_predictor(&c->band[1], dhigh, ihigh);
+
+        c->prev_samples[c->prev_samples_pos++] = rlow + rhigh;
+        c->prev_samples[c->prev_samples_pos++] = rlow - rhigh;
+        ff_g722_apply_qmf(c->prev_samples + c->prev_samples_pos - 24,
+                          &xout1, &xout2);
+        *out_buf++ = av_clip_int16(xout1 >> 11);
+        *out_buf++ = av_clip_int16(xout2 >> 11);
+        if (c->prev_samples_pos >= PREV_SAMPLES_BUF_SIZE) {
+            memmove(c->prev_samples, c->prev_samples + c->prev_samples_pos - 22,
+                    22 * sizeof(c->prev_samples[0]));
+            c->prev_samples_pos = 22;
+        }
     }
-    *data_size = out_len << 1;
+
+    *got_frame_ptr   = 1;
+    *(AVFrame *)data = c->frame;
+
     return avpkt->size;
 }
 
@@ -142,6 +148,7 @@ AVCodec ff_adpcm_g722_decoder = {
     .priv_data_size = sizeof(G722Context),
     .init           = g722_decode_init,
     .decode         = g722_decode_frame,
+    .capabilities   = CODEC_CAP_DR1,
     .long_name      = NULL_IF_CONFIG_SMALL("G.722 ADPCM"),
-    .max_lowres     = 1,
+    .priv_class     = &g722_decoder_class,
 };