binkaudio: switch to the new send/receive API

It is more natural for this codec and allows to avoid awkward constructs
like "consuming 0 bytes from input". Also, keep a reference to the input
packet to avoid unnecessary copying.

libavcodec/binkaudio.c

@@ -35,6 +35,7 @@
 #include "avcodec.h"
 #include "bitstream.h"
 #include "dct.h"
+#include "decode.h"
 #include "internal.h"
 #include "rdft.h"
 #include "wma_freqs.h"
@@ -57,7 +58,7 @@ typedef struct BinkAudioContext {
     float root;
     DECLARE_ALIGNED(32, FFTSample, coeffs)[BINK_BLOCK_MAX_SIZE];
     float previous[MAX_CHANNELS][BINK_BLOCK_MAX_SIZE / 16];  ///< coeffs from previous audio block
-    uint8_t *packet_buffer;
+    AVPacket *pkt;
     union {
         RDFTContext rdft;
         DCTContext dct;
@@ -140,6 +141,10 @@ static av_cold int decode_init(AVCodecContext *avctx)
     else
         return -1;
 
+    s->pkt = av_packet_alloc();
+    if (!s->pkt)
+        return AVERROR(ENOMEM);
+
     return 0;
 }
 
@@ -269,12 +274,13 @@ static av_cold int decode_end(AVCodecContext *avctx)
 {
     BinkAudioContext * s = avctx->priv_data;
     av_freep(&s->bands);
-    av_freep(&s->packet_buffer);
     if (CONFIG_BINKAUDIO_RDFT_DECODER && avctx->codec->id == AV_CODEC_ID_BINKAUDIO_RDFT)
         ff_rdft_end(&s->trans.rdft);
     else if (CONFIG_BINKAUDIO_DCT_DECODER)
         ff_dct_end(&s->trans.dct);
 
+    av_packet_free(&s->pkt);
+
     return 0;
 }
 
@@ -285,32 +291,26 @@ static void get_bits_align32(BitstreamContext *s)
         bitstream_skip(s, n);
 }
 
-static int decode_frame(AVCodecContext *avctx, void *data,
-                        int *got_frame_ptr, AVPacket *avpkt)
+static int binkaudio_receive_frame(AVCodecContext *avctx, AVFrame *frame)
 {
     BinkAudioContext *s = avctx->priv_data;
-    AVFrame *frame      = data;
     BitstreamContext *bc = &s->bc;
-    int ret, consumed = 0;
+    int ret;
 
-    if (!bitstream_bits_left(bc)) {
-        uint8_t *buf;
-        /* handle end-of-stream */
-        if (!avpkt->size) {
-            *got_frame_ptr = 0;
-            return 0;
-        }
-        if (avpkt->size < 4) {
+    if (!s->pkt->data) {
+        ret = ff_decode_get_packet(avctx, s->pkt);
+        if (ret < 0)
+            return ret;
+
+        if (s->pkt->size < 4) {
             av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
-            return AVERROR_INVALIDDATA;
+            ret = AVERROR_INVALIDDATA;
+            goto fail;
         }
-        buf = av_realloc(s->packet_buffer, avpkt->size + AV_INPUT_BUFFER_PADDING_SIZE);
-        if (!buf)
-            return AVERROR(ENOMEM);
-        s->packet_buffer = buf;
-        memcpy(s->packet_buffer, avpkt->data, avpkt->size);
-        bitstream_init(bc, s->packet_buffer, avpkt->size * 8);
-        consumed = avpkt->size;
+
+        ret = bitstream_init8(bc, s->pkt->data, s->pkt->size);
+        if (ret < 0)
+            goto fail;
 
         /* skip reported size */
         bitstream_skip(bc, 32);
@@ -329,11 +329,17 @@ static int decode_frame(AVCodecContext *avctx, void *data,
         return AVERROR_INVALIDDATA;
     }
     get_bits_align32(bc);
+    if (!bitstream_bits_left(bc)) {
+        memset(bc, 0, sizeof(*bc));
+        av_packet_unref(s->pkt);
+    }
 
     frame->nb_samples = s->block_size / avctx->channels;
-    *got_frame_ptr    = 1;
 
-    return consumed;
+    return 0;
+fail:
+    av_packet_unref(s->pkt);
+    return ret;
 }
 
 AVCodec ff_binkaudio_rdft_decoder = {
@@ -344,7 +350,7 @@ AVCodec ff_binkaudio_rdft_decoder = {
     .priv_data_size = sizeof(BinkAudioContext),
     .init           = decode_init,
     .close          = decode_end,
-    .decode         = decode_frame,
+    .receive_frame  = binkaudio_receive_frame,
     .capabilities   = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_DR1,
 };
 
@@ -356,6 +362,6 @@ AVCodec ff_binkaudio_dct_decoder = {
     .priv_data_size = sizeof(BinkAudioContext),
     .init           = decode_init,
     .close          = decode_end,
-    .decode         = decode_frame,
+    .receive_frame  = binkaudio_receive_frame,
     .capabilities   = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_DR1,
 };