avcodec/pcm-dvd: Avoid allocation of buffer

In this case, it also allows to remove the decoder's close function.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

libavcodec/pcm-dvd.c

@@ -34,8 +34,9 @@ typedef struct PCMDVDContext {
     int last_block_size;     // Size of the last block of samples in bytes
     int samples_per_block;   // Number of samples per channel per block
     int groups_per_block;    // Number of 20/24-bit sample groups per block
-    uint8_t *extra_samples;  // Pointer to leftover samples from a frame
     int extra_sample_count;  // Number of leftover samples in the buffer
+    uint8_t extra_samples[8 * 3 * 4];  // Space for leftover samples from a frame
+                                       // (8 channels, 3B/sample, 4 samples/block)
 } PCMDVDContext;
 
 static av_cold int pcm_dvd_decode_init(AVCodecContext *avctx)
@@ -44,18 +45,6 @@ static av_cold int pcm_dvd_decode_init(AVCodecContext *avctx)
 
     /* Invalid header to force parsing of the first header */
     s->last_header = -1;
-    /* reserve space for 8 channels, 3 bytes/sample, 4 samples/block */
-    if (!(s->extra_samples = av_malloc(8 * 3 * 4)))
-        return AVERROR(ENOMEM);
-
-    return 0;
-}
-
-static av_cold int pcm_dvd_decode_uninit(AVCodecContext *avctx)
-{
-    PCMDVDContext *s = avctx->priv_data;
-
-    av_freep(&s->extra_samples);
 
     return 0;
 }
@@ -310,7 +299,6 @@ AVCodec ff_pcm_dvd_decoder = {
     .priv_data_size = sizeof(PCMDVDContext),
     .init           = pcm_dvd_decode_init,
     .decode         = pcm_dvd_decode_frame,
-    .close          = pcm_dvd_decode_uninit,
     .capabilities   = AV_CODEC_CAP_DR1,
     .sample_fmts    = (const enum AVSampleFormat[]) {
         AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_S32, AV_SAMPLE_FMT_NONE