alacenc: add support for multi-channel encoding

1 files changed, 6 insertions, 40 deletions

diff --git a/libavcodec/alac.c b/libavcodec/alac.c
index 64c7f5400f..22882a56c0 100644
--- a/libavcodec/alac.c
+++ b/libavcodec/alac.c
@@ -52,9 +52,9 @@
 #include "internal.h"
 #include "unary.h"
 #include "mathops.h"
+#include "alac_data.h"
 
 #define ALAC_EXTRADATA_SIZE 36
-#define MAX_CHANNELS 8
 
 typedef struct {
     AVCodecContext *avctx;
@@ -76,40 +76,6 @@ typedef struct {
     int nb_samples;     /**< number of samples in the current frame */
 } ALACContext;
 
-enum RawDataBlockType {
-    /* At the moment, only SCE, CPE, LFE, and END are recognized. */
-    TYPE_SCE,
-    TYPE_CPE,
-    TYPE_CCE,
-    TYPE_LFE,
-    TYPE_DSE,
-    TYPE_PCE,
-    TYPE_FIL,
-    TYPE_END
-};
-
-static const uint8_t alac_channel_layout_offsets[8][8] = {
-    { 0 },
-    { 0, 1 },
-    { 2, 0, 1 },
-    { 2, 0, 1, 3 },
-    { 2, 0, 1, 3, 4 },
-    { 2, 0, 1, 4, 5, 3 },
-    { 2, 0, 1, 4, 5, 6, 3 },
-    { 2, 6, 7, 0, 1, 4, 5, 3 }
-};
-
-static const uint16_t alac_channel_layouts[8] = {
-    AV_CH_LAYOUT_MONO,
-    AV_CH_LAYOUT_STEREO,
-    AV_CH_LAYOUT_SURROUND,
-    AV_CH_LAYOUT_4POINT0,
-    AV_CH_LAYOUT_5POINT0_BACK,
-    AV_CH_LAYOUT_5POINT1_BACK,
-    AV_CH_LAYOUT_6POINT1_BACK,
-    AV_CH_LAYOUT_7POINT1_WIDE_BACK
-};
-
 static inline unsigned int decode_scalar(GetBitContext *gb, int k, int bps)
 {
     unsigned int x = get_unary_0_9(gb);
@@ -431,7 +397,7 @@ static int alac_decode_frame(AVCodecContext *avctx, void *data,
                              int *got_frame_ptr, AVPacket *avpkt)
 {
     ALACContext *alac = avctx->priv_data;
-    enum RawDataBlockType element;
+    enum AlacRawDataBlockType element;
     int channels;
     int ch, ret, got_end;
 
@@ -458,7 +424,7 @@ static int alac_decode_frame(AVCodecContext *avctx, void *data,
         }
 
         ret = decode_element(avctx, data,
-                             alac_channel_layout_offsets[alac->channels - 1][ch],
+                             ff_alac_channel_layout_offsets[alac->channels - 1][ch],
                              channels);
         if (ret < 0 && get_bits_left(&alac->gb))
             return ret;
@@ -581,17 +547,17 @@ static av_cold int alac_decode_init(AVCodecContext * avctx)
         av_log(avctx, AV_LOG_WARNING, "Invalid channel count\n");
         alac->channels = avctx->channels;
     } else {
-        if (alac->channels > MAX_CHANNELS)
+        if (alac->channels > ALAC_MAX_CHANNELS)
             alac->channels = avctx->channels;
         else
             avctx->channels = alac->channels;
     }
-    if (avctx->channels > MAX_CHANNELS) {
+    if (avctx->channels > ALAC_MAX_CHANNELS) {
         av_log(avctx, AV_LOG_ERROR, "Unsupported channel count: %d\n",
                avctx->channels);
         return AVERROR_PATCHWELCOME;
     }
-    avctx->channel_layout = alac_channel_layouts[alac->channels - 1];
+    avctx->channel_layout = ff_alac_channel_layouts[alac->channels - 1];
 
     if ((ret = allocate_buffers(alac)) < 0) {
         av_log(avctx, AV_LOG_ERROR, "Error allocating buffers\n");