added pcm codecs
authorFabrice Bellard <fabrice@bellard.org>
Sun, 23 Sep 2001 17:16:51 +0000 (17:16 +0000)
committerFabrice Bellard <fabrice@bellard.org>
Sun, 23 Sep 2001 17:16:51 +0000 (17:16 +0000)
Originally committed as revision 140 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/Makefile
libavcodec/avcodec.h
libavcodec/pcm.c [new file with mode: 0644]
libavcodec/utils.c

index 03d7554..ad4f248 100644 (file)
@@ -6,7 +6,7 @@ LDFLAGS= -g
 OBJS= common.o utils.o mpegvideo.o h263.o jrevdct.o jfdctfst.o \
       mpegaudio.o ac3enc.o mjpeg.o resample.o dsputil.o \
       motion_est.o imgconvert.o imgresample.o msmpeg4.o \
-      mpeg12.o h263dec.o rv10.o mpegaudiodec.o
+      mpeg12.o h263dec.o rv10.o mpegaudiodec.o pcm.o
 ASM_OBJS=
 
 # currently using libac3 for ac3 decoding
index 5155c8f..b423b88 100644 (file)
@@ -1,3 +1,6 @@
+#ifndef AVCODEC_H
+#define AVCODEC_H
+
 #include "common.h"
 
 enum CodecID {
@@ -9,11 +12,20 @@ enum CodecID {
     CODEC_ID_AC3,
     CODEC_ID_MJPEG,
     CODEC_ID_MPEG4,
-    CODEC_ID_PCM,
     CODEC_ID_RAWVIDEO,
     CODEC_ID_MSMPEG4,
     CODEC_ID_H263P,
     CODEC_ID_H263I,
+
+    /* various pcm "codecs" */
+    CODEC_ID_PCM_S16LE,
+    CODEC_ID_PCM_S16BE,
+    CODEC_ID_PCM_U16LE,
+    CODEC_ID_PCM_U16BE,
+    CODEC_ID_PCM_S8,
+    CODEC_ID_PCM_U8,
+    CODEC_ID_PCM_MULAW,
+    CODEC_ID_PCM_ALAW,
 };
 
 enum CodecType {
@@ -30,6 +42,11 @@ enum PixelFormat {
     PIX_FMT_YUV444P,
 };
 
+/* currently unused, may be used if 24/32 bits samples ever supported */
+enum SampleFormat {
+    SAMPLE_FMT_S16 = 0,         /* signed 16 bits */
+};
+
 /* in bytes */
 #define AVCODEC_MAX_AUDIO_FRAME_SIZE 18432
 
@@ -74,6 +91,7 @@ typedef struct AVCodecContext {
     /* audio only */
     int sample_rate; /* samples per sec */
     int channels;
+    int sample_fmt;  /* sample format, currenly unused */
 
     /* the following data should not be initialized */
     int frame_size; /* in samples, initialized when calling 'init' */
@@ -130,13 +148,28 @@ extern AVCodec mpeg_decoder;
 extern AVCodec h263i_decoder;
 extern AVCodec rv10_decoder;
 extern AVCodec mjpeg_decoder;
+extern AVCodec mp3_decoder;
 
-/* dummy raw codecs */
-extern AVCodec pcm_codec;
+/* pcm codecs */
+#define PCM_CODEC(id, name) \
+extern AVCodec name ## _decoder; \
+extern AVCodec name ## _encoder;
+
+PCM_CODEC(CODEC_ID_PCM_S16LE, pcm_s16le);
+PCM_CODEC(CODEC_ID_PCM_S16BE, pcm_s16be);
+PCM_CODEC(CODEC_ID_PCM_U16LE, pcm_u16le);
+PCM_CODEC(CODEC_ID_PCM_U16BE, pcm_u16be);
+PCM_CODEC(CODEC_ID_PCM_S8, pcm_s8);
+PCM_CODEC(CODEC_ID_PCM_U8, pcm_u8);
+PCM_CODEC(CODEC_ID_PCM_ALAW, pcm_alaw);
+PCM_CODEC(CODEC_ID_PCM_MULAW, pcm_mulaw);
+
+#undef PCM_CODEC
+
+/* dummy raw video codec */
 extern AVCodec rawvideo_codec;
 
 /* the following codecs use external GPL libs */
-extern AVCodec mp3_decoder;
 extern AVCodec ac3_decoder;
 
 /* resample.c */
@@ -203,3 +236,5 @@ int avcodec_encode_video(AVCodecContext *avctx, UINT8 *buf, int buf_size,
 int avcodec_close(AVCodecContext *avctx);
 
 void avcodec_register_all(void);
+
+#endif /* AVCODEC_H */
diff --git a/libavcodec/pcm.c b/libavcodec/pcm.c
new file mode 100644 (file)
index 0000000..a3895f5
--- /dev/null
@@ -0,0 +1,367 @@
+/*
+ * PCM codecs
+ * Copyright (c) 2001 Gerard Lantau.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#include "avcodec.h"
+
+/* from g711.c by SUN microsystems (unrestricted use) */
+
+#define        SIGN_BIT        (0x80)          /* Sign bit for a A-law byte. */
+#define        QUANT_MASK      (0xf)           /* Quantization field mask. */
+#define        NSEGS           (8)             /* Number of A-law segments. */
+#define        SEG_SHIFT       (4)             /* Left shift for segment number. */
+#define        SEG_MASK        (0x70)          /* Segment field mask. */
+
+#define        BIAS            (0x84)          /* Bias for linear code. */
+
+/*
+ * alaw2linear() - Convert an A-law value to 16-bit linear PCM
+ *
+ */
+static int alaw2linear(unsigned char   a_val)
+{
+       int             t;
+       int             seg;
+
+       a_val ^= 0x55;
+
+       t = (a_val & QUANT_MASK) << 4;
+       seg = ((unsigned)a_val & SEG_MASK) >> SEG_SHIFT;
+       switch (seg) {
+       case 0:
+               t += 8;
+               break;
+       case 1:
+               t += 0x108;
+               break;
+       default:
+               t += 0x108;
+               t <<= seg - 1;
+       }
+       return ((a_val & SIGN_BIT) ? t : -t);
+}
+
+static int ulaw2linear(unsigned char   u_val)
+{
+       int             t;
+
+       /* Complement to obtain normal u-law value. */
+       u_val = ~u_val;
+
+       /*
+        * Extract and bias the quantization bits. Then
+        * shift up by the segment number and subtract out the bias.
+        */
+       t = ((u_val & QUANT_MASK) << 3) + BIAS;
+       t <<= ((unsigned)u_val & SEG_MASK) >> SEG_SHIFT;
+
+       return ((u_val & SIGN_BIT) ? (BIAS - t) : (t - BIAS));
+}
+
+/* 16384 entries per table */
+static UINT8 *linear_to_alaw = NULL;
+static int linear_to_alaw_ref = 0;
+
+static UINT8 *linear_to_ulaw = NULL;
+static int linear_to_ulaw_ref = 0;
+
+static void build_xlaw_table(UINT8 *linear_to_xlaw, 
+                             int (*xlaw2linear)(unsigned char),
+                             int mask) 
+{
+    int i, j, v, v1, v2;
+
+    j = 0;
+    for(i=0;i<128;i++) {
+        if (i != 127) {
+            v1 = xlaw2linear(i ^ mask);
+            v2 = xlaw2linear((i + 1) ^ mask);
+            v = (v1 + v2 + 4) >> 3;
+        } else {
+            v = 8192;
+        }
+        for(;j<v;j++) {
+            linear_to_xlaw[8192 + j] = (i ^ mask);
+            if (j > 0)
+                linear_to_xlaw[8192 - j] = (i ^ (mask ^ 0x80));
+        }
+    }
+    linear_to_xlaw[0] = linear_to_xlaw[1];
+}
+
+static int encode_init(AVCodecContext *avctx)
+{
+    avctx->frame_size = 1;
+    switch(avctx->codec->id) {
+    case CODEC_ID_PCM_ALAW:
+        if (linear_to_alaw_ref == 0) {
+            linear_to_alaw = malloc(16384);
+            if (!linear_to_alaw)
+                return -1;
+            build_xlaw_table(linear_to_alaw, alaw2linear, 0xd5);
+        }
+        linear_to_alaw_ref++;
+        break;
+    case CODEC_ID_PCM_MULAW:
+        if (linear_to_ulaw_ref == 0) {
+            linear_to_ulaw = malloc(16384);
+            if (!linear_to_ulaw)
+                return -1;
+            build_xlaw_table(linear_to_ulaw, ulaw2linear, 0xff);
+        }
+        linear_to_ulaw_ref++;
+        break;
+    default:
+        break;
+    }
+    return 0;
+}
+
+static int encode_close(AVCodecContext *avctx)
+{
+    switch(avctx->codec->id) {
+    case CODEC_ID_PCM_ALAW:
+        if (--linear_to_alaw_ref == 0)
+            free(linear_to_alaw);
+        break;
+    case CODEC_ID_PCM_MULAW:
+        if (--linear_to_ulaw_ref == 0)
+            free(linear_to_ulaw);
+        break;
+    default:
+        /* nothing to free */
+        break;
+    }
+    return 0;
+}
+
+static int encode_frame(AVCodecContext *avctx,
+                        unsigned char *frame, int buf_size, void *data)
+{
+    int n, sample_size, v;
+    short *samples;
+    unsigned char *dst;
+
+    switch(avctx->codec->id) {
+    case CODEC_ID_PCM_S16LE:
+    case CODEC_ID_PCM_S16BE:
+    case CODEC_ID_PCM_U16LE:
+    case CODEC_ID_PCM_U16BE:
+        sample_size = 2;
+        break;
+    default:
+        sample_size = 1;
+        break;
+    }
+    n = buf_size / sample_size;
+    samples = data;
+    dst = frame;
+
+    switch(avctx->codec->id) {
+    case CODEC_ID_PCM_S16LE:
+        for(;n>0;n--) {
+            v = *samples++;
+            dst[0] = v & 0xff;
+            dst[1] = v >> 8;
+            dst += 2;
+        }
+        break;
+    case CODEC_ID_PCM_S16BE:
+        for(;n>0;n--) {
+            v = *samples++;
+            dst[0] = v >> 8;
+            dst[1] = v;
+            dst += 2;
+        }
+        break;
+    case CODEC_ID_PCM_U16LE:
+        for(;n>0;n--) {
+            v = *samples++;
+            v += 0x8000;
+            dst[0] = v & 0xff;
+            dst[1] = v >> 8;
+            dst += 2;
+        }
+        break;
+    case CODEC_ID_PCM_U16BE:
+        for(;n>0;n--) {
+            v = *samples++;
+            v += 0x8000;
+            dst[0] = v >> 8;
+            dst[1] = v;
+            dst += 2;
+        }
+        break;
+    case CODEC_ID_PCM_S8:
+        for(;n>0;n--) {
+            v = *samples++;
+            dst[0] = (v + 128) >> 8;
+            dst++;
+        }
+        break;
+    case CODEC_ID_PCM_U8:
+        for(;n>0;n--) {
+            v = *samples++;
+            dst[0] = ((v + 128) >> 8) + 128;
+            dst++;
+        }
+        break;
+    case CODEC_ID_PCM_ALAW:
+        for(;n>0;n--) {
+            v = *samples++;
+            dst[0] = linear_to_alaw[(v + 32768) >> 2];
+            dst++;
+        }
+        break;
+    case CODEC_ID_PCM_MULAW:
+        for(;n>0;n--) {
+            v = *samples++;
+            dst[0] = linear_to_ulaw[(v + 32768) >> 2];
+            dst++;
+        }
+        break;
+    default:
+        return -1;
+    }
+    return dst - frame;
+}
+
+typedef struct PCMDecode {
+    short table[256];
+} PCMDecode;
+
+static int decode_init(AVCodecContext * avctx)
+{
+    PCMDecode *s = avctx->priv_data;
+    int i;
+
+    switch(avctx->codec->id) {
+    case CODEC_ID_PCM_ALAW:
+        for(i=0;i<256;i++)
+            s->table[i] = alaw2linear(i);
+        break;
+    case CODEC_ID_PCM_MULAW:
+        for(i=0;i<256;i++)
+            s->table[i] = ulaw2linear(i);
+        break;
+    default:
+        break;
+    }
+    return 0;
+}
+
+static int decode_frame(AVCodecContext *avctx, 
+                        void *data, int *data_size,
+                        UINT8 *buf, int buf_size)
+{
+    PCMDecode *s = avctx->priv_data;
+    int n;
+    short *samples;
+    UINT8 *src;
+
+    samples = data;
+    src = buf;
+
+    switch(avctx->codec->id) {
+    case CODEC_ID_PCM_S16LE:
+        n = buf_size >> 1;
+        for(;n>0;n--) {
+            *samples++ = src[0] | (src[1] << 8);
+            src += 2;
+        }
+        break;
+    case CODEC_ID_PCM_S16BE:
+        n = buf_size >> 1;
+        for(;n>0;n--) {
+            *samples++ = (src[0] << 8) | src[1];
+            src += 2;
+        }
+        break;
+    case CODEC_ID_PCM_U16LE:
+        n = buf_size >> 1;
+        for(;n>0;n--) {
+            *samples++ = (src[0] | (src[1] << 8)) - 0x8000;
+            src += 2;
+        }
+        break;
+    case CODEC_ID_PCM_U16BE:
+        n = buf_size >> 1;
+        for(;n>0;n--) {
+            *samples++ = ((src[0] << 8) | src[1]) - 0x8000;
+            src += 2;
+        }
+        break;
+    case CODEC_ID_PCM_S8:
+        n = buf_size;
+        for(;n>0;n--) {
+            *samples++ = src[0] << 8;
+            src++;
+        }
+        break;
+    case CODEC_ID_PCM_U8:
+        n = buf_size;
+        for(;n>0;n--) {
+            *samples++ = ((int)src[0] - 128) << 8;
+            src++;
+        }
+        break;
+    case CODEC_ID_PCM_ALAW:
+    case CODEC_ID_PCM_MULAW:
+        n = buf_size;
+        for(;n>0;n--) {
+            *samples++ = s->table[src[0]];
+            src++;
+        }
+        break;
+    default:
+        *data_size = 0;
+        return -1;
+    }
+    *data_size = (UINT8 *)samples - (UINT8 *)data;
+    return src - buf;
+}
+
+#define PCM_CODEC(id, name)                     \
+AVCodec name ## _encoder = {                    \
+    #name,                                      \
+    CODEC_TYPE_AUDIO,                           \
+    id,                                         \
+    0,                                          \
+    encode_init,                                \
+    encode_frame,                               \
+    encode_close,                               \
+    NULL,                                       \
+};                                              \
+AVCodec name ## _decoder = {                    \
+    #name,                                      \
+    CODEC_TYPE_AUDIO,                           \
+    id,                                         \
+    sizeof(PCMDecode),                          \
+    decode_init,                                \
+    NULL,                                       \
+    NULL,                                       \
+    decode_frame,                               \
+};
+
+PCM_CODEC(CODEC_ID_PCM_S16LE, pcm_s16le);
+PCM_CODEC(CODEC_ID_PCM_S16BE, pcm_s16be);
+PCM_CODEC(CODEC_ID_PCM_U16LE, pcm_u16le);
+PCM_CODEC(CODEC_ID_PCM_U16BE, pcm_u16be);
+PCM_CODEC(CODEC_ID_PCM_S8, pcm_s8);
+PCM_CODEC(CODEC_ID_PCM_U8, pcm_u8);
+PCM_CODEC(CODEC_ID_PCM_ALAW, pcm_alaw);
+PCM_CODEC(CODEC_ID_PCM_MULAW, pcm_mulaw);
index dd397af..d93c8d9 100644 (file)
@@ -205,6 +205,7 @@ void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
     const char *codec_name;
     AVCodec *p;
     char buf1[32];
+    int bitrate;
 
     if (encode)
         p = avcodec_find_encoder(enc->codec_id);
@@ -245,6 +246,7 @@ void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
                      enc->width, enc->height, 
                      (float)enc->frame_rate / FRAME_RATE_BASE);
         }
+        bitrate = enc->bit_rate;
         break;
     case CODEC_TYPE_AUDIO:
         snprintf(buf, buf_size,
@@ -256,13 +258,31 @@ void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
                      enc->sample_rate,
                      enc->channels == 2 ? "stereo" : "mono");
         }
+        /* for PCM codecs, compute bitrate directly */
+        switch(enc->codec_id) {
+        case CODEC_ID_PCM_S16LE:
+        case CODEC_ID_PCM_S16BE:
+        case CODEC_ID_PCM_U16LE:
+        case CODEC_ID_PCM_U16BE:
+            bitrate = enc->sample_rate * 16;
+            break;
+        case CODEC_ID_PCM_S8:
+        case CODEC_ID_PCM_U8:
+        case CODEC_ID_PCM_ALAW:
+        case CODEC_ID_PCM_MULAW:
+            bitrate = enc->sample_rate * 8;
+            break;
+        default:
+            bitrate = enc->bit_rate;
+            break;
+        }
         break;
     default:
         abort();
     }
-    if (enc->bit_rate != 0) {
+    if (bitrate != 0) {
         snprintf(buf + strlen(buf), buf_size - strlen(buf), 
-                 ", %d kb/s", enc->bit_rate / 1000);
+                 ", %d kb/s", bitrate / 1000);
     }
 }
 
@@ -370,7 +390,6 @@ void avcodec_register_all(void)
     register_avcodec(&mpeg4_encoder);
     register_avcodec(&msmpeg4_encoder);
 #endif /* CONFIG_ENCODERS */
-    register_avcodec(&pcm_codec);
     register_avcodec(&rawvideo_codec);
 
     /* decoders */
@@ -382,13 +401,28 @@ void avcodec_register_all(void)
     register_avcodec(&h263i_decoder);
     register_avcodec(&rv10_decoder);
     register_avcodec(&mjpeg_decoder);
-//#ifdef CONFIG_MPGLIB
     register_avcodec(&mp3_decoder);
-//#endif
 #ifdef CONFIG_AC3
     register_avcodec(&ac3_decoder);
 #endif
 #endif /* CONFIG_DECODERS */
+
+    /* pcm codecs */
+
+#define PCM_CODEC(id, name) \
+    register_avcodec(& name ## _encoder); \
+    register_avcodec(& name ## _decoder); \
+
+PCM_CODEC(CODEC_ID_PCM_S16LE, pcm_s16le);
+PCM_CODEC(CODEC_ID_PCM_S16BE, pcm_s16be);
+PCM_CODEC(CODEC_ID_PCM_U16LE, pcm_u16le);
+PCM_CODEC(CODEC_ID_PCM_U16BE, pcm_u16be);
+PCM_CODEC(CODEC_ID_PCM_S8, pcm_s8);
+PCM_CODEC(CODEC_ID_PCM_U8, pcm_u8);
+PCM_CODEC(CODEC_ID_PCM_ALAW, pcm_alaw);
+PCM_CODEC(CODEC_ID_PCM_MULAW, pcm_mulaw);
+
+#undef PCM_CODEC
 }
 
 static int encode_init(AVCodecContext *s)
@@ -409,18 +443,6 @@ static int encode_frame(AVCodecContext *avctx,
     return -1;
 }
 
-/* dummy pcm codec */
-AVCodec pcm_codec = {
-    "pcm",
-    CODEC_TYPE_AUDIO,
-    CODEC_ID_PCM,
-    0,
-    encode_init,
-    encode_frame,
-    NULL,
-    decode_frame,
-};
-
 AVCodec rawvideo_codec = {
     "rawvideo",
     CODEC_TYPE_VIDEO,