Merge remote-tracking branch 'qatar/master'

[ffmpeg] / libavcodec / tta.c

diff --git a/libavcodec/tta.c b/libavcodec/tta.c
index db9c1b288e363ba00561dabe104fbed57da7143d..b463946724ada35b97702132d1355d53cdbf3f5d 100644 (file)
--- a/libavcodec/tta.c
+++ b/libavcodec/tta.c
@@ -2,20 +2,20 @@
  * TTA (The Lossless True Audio) decoder
  * Copyright (c) 2006 Alex Beregszaszi
  *
- * This file is part of Libav.
+ * This file is part of FFmpeg.
  *
- * Libav is free software; you can redistribute it and/or
+ * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
- * Libav is distributed in the hope that it will be useful,
+ * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
- * License along with Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
@@ -179,6 +179,16 @@ static int tta_get_unary(GetBitContext *gb)
     return ret;
 }
 
+static const int64_t tta_channel_layouts[7] = {
+    AV_CH_LAYOUT_STEREO,
+    AV_CH_LAYOUT_STEREO|AV_CH_LOW_FREQUENCY,
+    AV_CH_LAYOUT_QUAD,
+    0,
+    AV_CH_LAYOUT_5POINT1_BACK,
+    AV_CH_LAYOUT_5POINT1_BACK|AV_CH_BACK_CENTER,
+    AV_CH_LAYOUT_7POINT1_WIDE
+};
+
 static int tta_check_crc(TTAContext *s, const uint8_t *buf, int buf_size)
 {
     uint32_t crc, CRC;
@@ -208,8 +218,7 @@ static av_cold int tta_decode_init(AVCodecContext * avctx)
     {
         if (avctx->err_recognition & AV_EF_CRCCHECK) {
             s->crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE);
-            if (tta_check_crc(s, avctx->extradata, 18))
-                return AVERROR_INVALIDDATA;
+            tta_check_crc(s, avctx->extradata, 18);
         }
 
         /* signature */
@@ -225,6 +234,8 @@ static av_cold int tta_decode_init(AVCodecContext * avctx)
             return AVERROR(EINVAL);
         }
         avctx->channels = s->channels = get_bits(&s->gb, 16);
+        if (s->channels > 1 && s->channels < 9)
+            avctx->channel_layout = tta_channel_layouts[s->channels-2];
         avctx->bits_per_coded_sample = get_bits(&s->gb, 16);
         s->bps = (avctx->bits_per_coded_sample + 7) / 8;
         avctx->sample_rate = get_bits_long(&s->gb, 32);
@@ -240,6 +251,7 @@ static av_cold int tta_decode_init(AVCodecContext * avctx)
         }
 
         switch(s->bps) {
+        case 1: avctx->sample_fmt = AV_SAMPLE_FMT_U8; break;
         case 2:
             avctx->sample_fmt = AV_SAMPLE_FMT_S16;
             avctx->bits_per_raw_sample = 16;
@@ -248,6 +260,7 @@ static av_cold int tta_decode_init(AVCodecContext * avctx)
             avctx->sample_fmt = AV_SAMPLE_FMT_S32;
             avctx->bits_per_raw_sample = 24;
             break;
+        //case 4: avctx->sample_fmt = AV_SAMPLE_FMT_S32; break;
         default:
             av_log(avctx, AV_LOG_ERROR, "Invalid/unsupported sample format.\n");
             return AVERROR_INVALIDDATA;
@@ -285,11 +298,12 @@ static av_cold int tta_decode_init(AVCodecContext * avctx)
             return -1;
         }
 
-        if (s->bps == 2) {
+        if (s->bps < 3) {
             s->decode_buffer = av_mallocz(sizeof(int32_t)*s->frame_length*s->channels);
             if (!s->decode_buffer)
                 return AVERROR(ENOMEM);
-        }
+        } else
+            s->decode_buffer = NULL;
         s->ch_ctx = av_malloc(avctx->channels * sizeof(*s->ch_ctx));
         if (!s->ch_ctx) {
             av_freep(&s->decode_buffer);
@@ -396,8 +410,7 @@ static int tta_decode_frame(AVCodecContext *avctx, void *data,
         }
 
         // extract coded value
-#define UNFOLD(x) (((x)&1) ? (++(x)>>1) : (-(x)>>1))
-        *p = UNFOLD(value);
+        *p = 1 + ((value >> 1) ^ ((value & 1) - 1));
 
         // run hybrid filter
         ttafilter_process(filter, p);
@@ -405,10 +418,10 @@ static int tta_decode_frame(AVCodecContext *avctx, void *data,
         // fixed order prediction
 #define PRED(x, k) (int32_t)((((uint64_t)x << k) - x) >> k)
         switch (s->bps) {
-            case 1: *p += PRED(*predictor, 4); break;
-            case 2:
-            case 3: *p += PRED(*predictor, 5); break;
-            case 4: *p += *predictor; break;
+        case 1: *p += PRED(*predictor, 4); break;
+        case 2:
+        case 3: *p += PRED(*predictor, 5); break;
+        case 4: *p +=      *predictor;     break;
         }
         *predictor = *p;
 
@@ -433,17 +446,28 @@ static int tta_decode_frame(AVCodecContext *avctx, void *data,
     skip_bits_long(&s->gb, 32); // frame crc
 
     // convert to output buffer
-    if (s->bps == 2) {
-        int16_t *samples = (int16_t *)s->frame.data[0];
+    switch (s->bps) {
+    case 1: {
+        uint8_t *samples = (uint8_t *)s->frame.data[0];
+        for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++)
+            *samples++ = *p + 0x80;
+        break;
+        }
+    case 2: {
+        uint16_t *samples = (int16_t *)s->frame.data[0];
         for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++)
             *samples++ = *p;
-    } else {
+        break;
+        }
+    case 3: {
         // shift samples for 24-bit sample format
         int32_t *samples = (int32_t *)s->frame.data[0];
-        for (i = 0; i < framelen * s->channels; i++)
+        for (p = s->decode_buffer; p < s->decode_buffer + (framelen * s->channels); p++)
             *samples++ <<= 8;
         // reset decode buffer
         s->decode_buffer = NULL;
+        break;
+        }
     }
 
     *got_frame_ptr   = 1;
@@ -460,7 +484,9 @@ error:
 static av_cold int tta_decode_close(AVCodecContext *avctx) {
     TTAContext *s = avctx->priv_data;
 
-    av_free(s->decode_buffer);
+    if (s->bps < 3)
+        av_free(s->decode_buffer);
+    s->decode_buffer = NULL;
     av_freep(&s->ch_ctx);
 
     return 0;