Speex encoder specially tailored to create voice UI snippets. Small fixups to libspeex to allow it to be built.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@15640 a1c6a512-1295-4272-9138-f99709370657

tools/rbspeex/rbspeexenc.c

@@ -0,0 +1,239 @@
+/**************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ *
+ * Copyright (C) 2007 Thom Johansen
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+
+#include <speex/speex.h>
+#include <speex/speex_resampler.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdbool.h>
+
+/* Read an unaligned 32-bit little endian long from buffer. */
+unsigned int get_long_le(unsigned char *p)
+{
+    return p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
+}
+
+bool get_wave_metadata(FILE *fd, int *numchan, int *bps, int *sr, int *numsamples)
+{
+    unsigned char buf[1024];
+    unsigned long totalsamples = 0;
+    unsigned long channels = 0;
+    unsigned long bitspersample = 0;
+    unsigned long numbytes = 0;
+    size_t read_bytes;
+    int i;
+
+    if ((read_bytes = fread(buf, 1, 12, fd)) < 12)
+        return false;
+
+    if ((memcmp(buf, "RIFF",4) != 0) || (memcmp(&buf[8], "WAVE", 4) != 0))
+        return false;
+
+    /* iterate over WAVE chunks until 'data' chunk */
+    while (1) {
+        /* get chunk header */
+        if ((read_bytes = fread(buf, 1, 8, fd)) < 8)
+            return false;
+
+        /* chunkSize */
+        i = get_long_le(&buf[4]);
+
+        if (memcmp(buf, "fmt ", 4) == 0) {
+            /* get rest of chunk */
+            if ((read_bytes = fread(buf, 1, 16, fd)) < 16)
+                return false;
+
+            i -= 16;
+
+            channels = *numchan = buf[2] | (buf[3] << 8);
+            *sr = get_long_le(&buf[4]);
+            /* wBitsPerSample */
+            bitspersample = *bps = buf[14] | (buf[15] << 8);
+        } else if (memcmp(buf, "data", 4) == 0) {
+            numbytes = i;
+            break;
+        } else if (memcmp(buf, "fact", 4) == 0) {
+            /* dwSampleLength */
+            if (i >= 4) {
+                /* get rest of chunk */
+                if ((read_bytes = read(buf, 1, 4, fd)) < 4)
+                    return false;
+
+                i -= 4;
+                totalsamples = get_long_le(buf);
+            }
+        }
+
+        /* seek to next chunk (even chunk sizes must be padded) */
+        if (i & 0x01)
+            i++;
+
+        if (fseek(fd, i, SEEK_CUR) < 0)
+            return false;
+    }
+
+    if ((numbytes == 0) || (channels == 0))
+        return false;
+
+    if (totalsamples == 0) {
+        /* for PCM only */
+        totalsamples = numbytes/((((bitspersample - 1) / 8) + 1)*channels);
+    }
+    *numsamples = totalsamples;
+    return true;
+}
+
+int main(int argc, char **argv)
+{
+    FILE *fin, *fout;
+    spx_int16_t *in, *inpos;
+    spx_int16_t enc_buf[640]; /* Max frame size */
+    char cbits[200];
+    int nbytes;
+    void *st;
+    SpeexResamplerState *resampler = NULL;
+    SpeexBits bits;
+    int i, tmp;
+    float ftmp;
+    int numchan, bps, sr, numsamples;
+    int frame_size;
+
+    if (argc < 3) {
+        printf("Usage: rbspeexenc [options] infile outfile\n"
+               "Options:\n"
+               "  -q x   Quality, floating point number in the range [0-10]\n"
+               "  -c x   Complexity, affects quality and encoding time, where\n"
+               "         both increase with increasing values, range [0-10]\n"
+               "  Defaults are as in speexenc.\n"
+               "\nWARNING: This tool will create files that are only usable by Rockbox!\n"
+        );
+        return 1;
+    }
+
+    /* We'll eat an entire WAV file here, and encode it with Speex, packing the
+     * bits as tightly as we can. Output is completely raw, with absolutely
+     * nothing to identify the contents.
+	 */
+
+    /* Wideband encoding */
+    st = speex_encoder_init(&speex_wb_mode);
+
+    /* VBR */
+    tmp = 1;
+    speex_encoder_ctl(st, SPEEX_SET_VBR, &tmp);
+    /* Quality, 0-10 */
+    ftmp = 8.f;
+    for (i = 1; i < argc - 2; ++i) {
+        if (strncmp(argv[i], "-q", 2) == 0) {
+            ftmp = atof(argv[i + 1]);
+            break;
+        }
+    }
+    speex_encoder_ctl(st, SPEEX_SET_VBR_QUALITY, &ftmp);
+    /* Complexity, 0-10 */
+    tmp = 3;
+    for (i = 1; i < argc - 2; ++i) {
+        if (strncmp(argv[i], "-c", 2) == 0) {
+            tmp = atoi(argv[i + 1]);
+            break;
+        }
+    }
+    speex_encoder_ctl(st, SPEEX_SET_COMPLEXITY, &tmp);
+    speex_encoder_ctl(st, SPEEX_GET_FRAME_SIZE, &frame_size);
+
+    fin = fopen(argv[argc - 2], "rb");
+    if (!get_wave_metadata(fin, &numchan, &bps, &sr, &numsamples)) {
+        printf("invalid wave file!\n");
+        return 1;
+    }
+    if (sr != 16000) {
+        resampler = speex_resampler_init(1, sr, 16000, 10, NULL);
+        speex_resampler_skip_zeros(resampler);
+        printf("Resampling from %i Hz to 16000 Hz\n", sr);
+    }
+    if (numchan != 1) {
+        printf("Error: input file must be mono\n");
+        return 1;
+    }
+    if (bps != 16) {
+        printf("samples must be 16 bit!\n");
+        return 1;
+    }
+
+    /* Read input samples into a buffer */
+    in = malloc(numsamples*2);
+    if (malloc == NULL) {
+        printf("error on malloc\n");
+        return 1;
+    }
+    fread(in, 2, numsamples, fin);
+    fclose(fin);
+    
+    speex_bits_init(&bits);
+    inpos = in;
+    fout = fopen(argv[argc - 1], "wb");
+
+    while (numsamples > 0) {
+        int samples = frame_size;
+
+        /* Check if we need to resample */
+        if (sr != 16000) {
+            spx_uint32_t in_len = numsamples, out_len = frame_size;
+
+            /* Limit this or resampler will try to allocate it all on stack */
+            if (in_len > 2000)
+                in_len = 2000;
+            speex_resampler_process_int(resampler, 0, inpos, &in_len,
+                                        enc_buf, &out_len);
+            inpos += in_len;
+            samples = out_len;
+            numsamples -= in_len;
+        } else {
+            if (samples > numsamples)
+                samples = numsamples;
+            memcpy(enc_buf, inpos, samples*2);
+            inpos += frame_size;
+            numsamples -= frame_size;
+        }
+        /* Pad out with zeros if we didn't fill all input */
+        memset(enc_buf + samples, 0, (frame_size - samples)*2);
+
+        speex_encode_int(st, enc_buf, &bits);
+
+        /* Copy the bits to an array of char that can be written */
+        nbytes = speex_bits_write_whole_bytes(&bits, cbits, 200);
+
+        /* Write the compressed data */
+        fwrite(cbits, 1, nbytes, fout);
+    }
+ 
+     /* Squeeze out the last bits */
+    nbytes = speex_bits_write(&bits, cbits, 200);
+    fwrite(cbits, 1, nbytes, fout);
+
+    /*Destroy the encoder state*/
+    speex_encoder_destroy(st);
+    /*Destroy the bit-packing struct*/
+    speex_bits_destroy(&bits);
+    if (resampler != NULL)
+        speex_resampler_destroy(resampler);
+    fclose(fout);
+    free(in);
+    return 0;
+}