[libav-devel] [PATCH 24/57] imc: implement new audio decoding API

Justin Ruggles justin.ruggles at gmail.com
Sat Nov 26 23:06:35 CET 2011


---
 libavcodec/imc.c |   29 +++++++++++++++++++----------
 1 files changed, 19 insertions(+), 10 deletions(-)

diff --git a/libavcodec/imc.c b/libavcodec/imc.c
index 1f1db6c..b55eee9 100644
--- a/libavcodec/imc.c
+++ b/libavcodec/imc.c
@@ -51,6 +51,8 @@
 #define COEFFS 256
 
 typedef struct {
+    AVFrame frame;
+
     float old_floor[BANDS];
     float flcoeffs1[BANDS];
     float flcoeffs2[BANDS];
@@ -168,6 +170,10 @@ static av_cold int imc_decode_init(AVCodecContext * avctx)
     dsputil_init(&q->dsp, avctx);
     avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
     avctx->channel_layout = AV_CH_LAYOUT_MONO;
+
+    avcodec_get_frame_defaults(&q->frame);
+    avctx->coded_frame = &q->frame;
+
     return 0;
 }
 
@@ -649,9 +655,8 @@ static int imc_get_coeffs (IMCContext* q) {
     return 0;
 }
 
-static int imc_decode_frame(AVCodecContext * avctx,
-                            void *data, int *data_size,
-                            AVPacket *avpkt)
+static int imc_decode_frame(AVCodecContext * avctx, void *data,
+                            int *got_frame_ptr, AVPacket *avpkt)
 {
     const uint8_t *buf = avpkt->data;
     int buf_size = avpkt->size;
@@ -659,7 +664,7 @@ static int imc_decode_frame(AVCodecContext * avctx,
     IMCContext *q = avctx->priv_data;
 
     int stream_format_code;
-    int imc_hdr, i, j, out_size, ret;
+    int imc_hdr, i, j, ret;
     int flag;
     int bits, summer;
     int counter, bitscount;
@@ -670,15 +675,16 @@ static int imc_decode_frame(AVCodecContext * avctx,
         return AVERROR_INVALIDDATA;
     }
 
-    out_size = COEFFS * 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 */
+    q->frame.nb_samples = COEFFS;
+    if ((ret = avctx->get_buffer(avctx, &q->frame)) < 0) {
+        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+        return ret;
     }
+    q->out_samples = (float *)q->frame.data[0];
 
     q->dsp.bswap16_buf(buf16, (const uint16_t*)buf, IMC_BLOCK_SIZE / 2);
 
-    q->out_samples = data;
     init_get_bits(&q->gb, (const uint8_t*)buf16, IMC_BLOCK_SIZE * 8);
 
     /* Check the frame header */
@@ -823,7 +829,8 @@ static int imc_decode_frame(AVCodecContext * avctx,
 
     imc_imdct256(q);
 
-    *data_size = out_size;
+    *got_frame_ptr   = 1;
+    *(AVFrame *)data = q->frame;
 
     return IMC_BLOCK_SIZE;
 }
@@ -834,6 +841,7 @@ static av_cold int imc_decode_close(AVCodecContext * avctx)
     IMCContext *q = avctx->priv_data;
 
     ff_fft_end(&q->fft);
+
     return 0;
 }
 
@@ -846,5 +854,6 @@ AVCodec ff_imc_decoder = {
     .init = imc_decode_init,
     .close = imc_decode_close,
     .decode = imc_decode_frame,
+    .capabilities = CODEC_CAP_DR1,
     .long_name = NULL_IF_CONFIG_SMALL("IMC (Intel Music Coder)"),
 };
-- 
1.7.1



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