refactor pcm io routines

MSVC/fdkaac.vcxproj

@@ -102,6 +102,7 @@ copy ..\fdk-aac\libSYS\include\machine_type.h include\fdk-aac\ </Command>
     <ClCompile Include="..\src\main.c" />
     <ClCompile Include="..\src\metadata.c" />
     <ClCompile Include="..\src\parson.c" />
+    <ClCompile Include="..\src\pcm_readhelper.c" />
     <ClCompile Include="..\src\pcm_sint16_converter.c" />
     <ClCompile Include="..\src\progress.c" />
     <ClCompile Include="..\src\wav_reader.c" />
@@ -115,6 +116,7 @@ copy ..\fdk-aac\libSYS\include\machine_type.h include\fdk-aac\ </Command>
     <ClInclude Include="..\src\m4af_endian.h" />
     <ClInclude Include="..\src\metadata.h" />
     <ClInclude Include="..\src\parson.h" />
+    <ClInclude Include="..\src\pcm_reader.h" />
     <ClInclude Include="..\src\progress.h" />
     <ClInclude Include="..\src\wav_reader.h" />
   </ItemGroup>

Makefile.am

@@ -10,6 +10,7 @@ fdkaac_SOURCES = \
     src/main.c                 \
     src/metadata.c             \
     src/parson.c               \
+    src/pcm_readhelper.c       \
     src/pcm_sint16_converter.c \
     src/progress.c             \
     src/wav_reader.c

src/main.c

@@ -643,12 +643,15 @@ int parse_raw_spec(const char *spec, pcm_sample_description_t *desc)
     return 0;
 }
 
+static pcm_io_vtbl_t pcm_io_vtbl = {
+    read_callback, seek_callback, tell_callback
+};
+static pcm_io_vtbl_t pcm_io_vtbl_noseek = { read_callback, 0, 0 };
+
 static
 pcm_reader_t *open_input(aacenc_param_ex_t *params)
 {
-    wav_io_context_t wav_io = {
+    pcm_io_context_t io = { 0 };
-        read_callback, seek_callback, tell_callback
-    };
     pcm_reader_t *reader = 0;
     struct stat stb = { 0 };
 
@@ -657,11 +660,13 @@ pcm_reader_t *open_input(aacenc_param_ex_t *params)
                        strerror(errno));
         goto END;
     }
-    if (fstat(fileno(params->input_fp), &stb) == 0
+    io.cookie = params->input_fp;
-            && (stb.st_mode & S_IFMT) != S_IFREG) {
+    if (fstat(fileno(io.cookie), &stb) == 0
-        wav_io.seek = 0;
+            && (stb.st_mode & S_IFMT) == S_IFREG)
-        wav_io.tell = 0;
+        io.vtbl = &pcm_io_vtbl;
-    }
+    else
+        io.vtbl = &pcm_io_vtbl_noseek;
+
     if (params->is_raw) {
         int bytes_per_channel;
         pcm_sample_description_t desc = { 0 };
@@ -673,13 +678,12 @@ pcm_reader_t *open_input(aacenc_param_ex_t *params)
         desc.channels_per_frame = params->raw_channels;
         bytes_per_channel = (desc.bits_per_channel + 7) / 8;
         desc.bytes_per_frame = params->raw_channels * bytes_per_channel;
-        if ((reader = raw_open(&wav_io, params->input_fp, &desc)) == 0) {
+        if ((reader = raw_open(&io, &desc)) == 0) {
             fprintf(stderr, "ERROR: failed to open raw input\n");
             goto END;
         }
     } else {
-        if ((reader = wav_open(&wav_io, params->input_fp,
+        if ((reader = wav_open(&io, params->ignore_length)) == 0) {
-                               params->ignore_length)) == 0) {
             fprintf(stderr, "ERROR: broken / unsupported input file\n");
             goto END;
         }

src/pcm_reader.h

@@ -17,6 +17,21 @@ struct pcm_reader_t {
     pcm_reader_vtbl_t *vtbl;
 };
 
+typedef int (*pcm_read_callback)(void *cookie, void *data, uint32_t count);
+typedef int (*pcm_seek_callback)(void *cookie, int64_t off, int whence);
+typedef int64_t (*pcm_tell_callback)(void *cookie);
+
+typedef struct pcm_io_vtbl_t {
+    pcm_read_callback read;
+    pcm_seek_callback seek;
+    pcm_tell_callback tell;
+} pcm_io_vtbl_t;
+
+typedef struct pcm_io_context_t {
+    pcm_io_vtbl_t *vtbl;
+    void *cookie;
+} pcm_io_context_t;
+
 static inline
 const pcm_sample_description_t *pcm_get_format(pcm_reader_t *r)
 {
@@ -49,4 +64,31 @@ void pcm_teardown(pcm_reader_t **r)
 
 pcm_reader_t *pcm_open_sint16_converter(pcm_reader_t *reader);
 
+#define TRY_IO(expr) \
+    do { \
+        if ((expr)) goto FAIL; \
+    } while (0)
+
+int pcm_read(pcm_io_context_t *io, void *buffer, uint32_t size);
+int pcm_skip(pcm_io_context_t *io, int64_t count);
+
+static int pcm_seek(pcm_io_context_t *io, int64_t off, int whence)
+{
+    return io->vtbl->seek ? io->vtbl->seek(io->cookie, off, whence) : -1;
+}
+
+static inline int64_t pcm_tell(pcm_io_context_t *io)
+{
+    return io->vtbl->tell ? io->vtbl->tell(io->cookie) : -1;
+}
+
+int pcm_read16le(pcm_io_context_t *io, uint16_t *value);
+int pcm_read16be(pcm_io_context_t *io, uint16_t *value);
+int pcm_read32le(pcm_io_context_t *io, uint32_t *value);
+int pcm_read32be(pcm_io_context_t *io, uint32_t *value);
+int pcm_read64le(pcm_io_context_t *io, uint64_t *value);
+int pcm_read64be(pcm_io_context_t *io, uint64_t *value);
+int pcm_scanl(pcm_io_context_t *io, const char *fmt, ...);
+int pcm_scanb(pcm_io_context_t *io, const char *fmt, ...);
+
 #endif

src/pcm_readhelper.c

@@ -0,0 +1,154 @@
+/* 
+ * Copyright (C) 2013 nu774
+ * For conditions of distribution and use, see copyright notice in COPYING
+ */
+
+#if HAVE_CONFIG_H
+#  include "config.h"
+#endif
+
+#if HAVE_STDINT_H
+#  include <stdint.h>
+#endif
+
+#include <stdio.h>
+#include <stdarg.h>
+#include "pcm_reader.h"
+#include "m4af_endian.h"
+
+int pcm_read(pcm_io_context_t *io, void *buffer, uint32_t size)
+{
+    int rc;
+    uint32_t count = 0;
+
+    do {
+        rc = io->vtbl->read(io->cookie, buffer, size - count);
+        if (rc > 0)
+            count += rc;
+    } while (rc > 0 && count < size);
+    return count > 0 ? count : rc;
+}
+
+int pcm_skip(pcm_io_context_t *io, int64_t count)
+{
+    char buff[8192];
+    int rc;
+    pcm_io_vtbl_t *vp = io->vtbl;
+
+    if (count == 0 || pcm_seek(io, count, SEEK_CUR) >= 0)
+        return 0;
+    do {
+        if ((rc = vp->read(io->cookie, buff, count > 8192 ? 8192 : count)) > 0)
+            count -= rc;
+    } while (rc > 0 && count > 0);
+
+    return count == 0 ? 0 : -1;
+}
+
+int pcm_read16le(pcm_io_context_t *io, uint16_t *value)
+{
+    if (pcm_read(io, value, 2) == 2) {
+        *value = m4af_ltoh16(*value);
+        return 0;
+    }
+    return -1;
+}
+
+int pcm_read16be(pcm_io_context_t *io, uint16_t *value)
+{
+    if (pcm_read(io, value, 2) == 2) {
+        *value = m4af_btoh16(*value);
+        return 0;
+    }
+    return -1;
+}
+
+int pcm_read32le(pcm_io_context_t *io, uint32_t *value)
+{
+    if (pcm_read(io, value, 4) == 4) {
+        *value = m4af_ltoh32(*value);
+        return 0;
+    }
+    return -1;
+}
+
+int pcm_read32be(pcm_io_context_t *io, uint32_t *value)
+{
+    if (pcm_read(io, value, 4) == 4) {
+        *value = m4af_btoh32(*value);
+        return 0;
+    }
+    return -1;
+}
+
+int pcm_read64le(pcm_io_context_t *io, uint64_t *value)
+{
+    if (pcm_read(io, value, 8) == 8) {
+        *value = m4af_ltoh64(*value);
+        return 0;
+    }
+    return -1;
+}
+
+int pcm_read64be(pcm_io_context_t *io, uint64_t *value)
+{
+    if (pcm_read(io, value, 8) == 8) {
+        *value = m4af_btoh64(*value);
+        return 0;
+    }
+    return -1;
+}
+
+int pcm_scanl(pcm_io_context_t *io, const char *fmt, ...)
+{
+    int c, count = 0;
+    va_list ap;
+
+    va_start(ap, fmt);
+    while ((c = *fmt++)) {
+        switch (c) {
+        case 'S':
+            TRY_IO(pcm_read16le(io, va_arg(ap, uint16_t*)));
+            ++count;
+            break;
+        case 'L':
+            TRY_IO(pcm_read32le(io, va_arg(ap, uint32_t*)));
+            ++count;
+            break;
+        case 'Q':
+            TRY_IO(pcm_read64le(io, va_arg(ap, uint64_t*)));
+            ++count;
+            break;
+        }
+    }
+FAIL:
+    va_end(ap);
+    return count;
+}
+
+int pcm_scanb(pcm_io_context_t *io, const char *fmt, ...)
+{
+    int c, count = 0;
+    va_list ap;
+
+    va_start(ap, fmt);
+    while ((c = *fmt++)) {
+        switch (c) {
+        case 'S':
+            TRY_IO(pcm_read16be(io, va_arg(ap, uint16_t*)));
+            ++count;
+            break;
+        case 'L':
+            TRY_IO(pcm_read32be(io, va_arg(ap, uint32_t*)));
+            ++count;
+            break;
+        case 'Q':
+            TRY_IO(pcm_read64be(io, va_arg(ap, uint64_t*)));
+            ++count;
+            break;
+        }
+    }
+FAIL:
+    va_end(ap);
+    return count;
+}

src/wav_reader.c

@@ -15,23 +15,12 @@
 #include <string.h>
 #include <stdarg.h>
 #include "wav_reader.h"
-#include "m4af_endian.h"
 
 #define RIFF_FOURCC(a,b,c,d) ((a)|((b)<<8)|((c)<<16)|((d)<<24))
 
-#define TRY_IO(expr) \
+#define ENSURE(expr) \
     do { \
-        if (expr) \
+        if (!(expr)) goto FAIL;\
-            goto FAIL; \
-    } while (0)
-
-#define ASSERT_FORMAT(ctx, expr) \
-    do { \
-        if (!expr) { \
-            if (!ctx->last_error) \
-                ctx->last_error = WAV_INVALID_FORMAT; \
-            goto FAIL;\
-        } \
     } while (0)
 
 struct wav_reader_t {
@@ -41,9 +30,7 @@ struct wav_reader_t {
     int64_t position;
     int32_t data_offset;
     int ignore_length;
-    int last_error;
+    pcm_io_context_t io;
-    wav_io_context_t io;
-    void *io_cookie;
 };
 
 static const uint8_t WAV_GUID_PCM[] = {
@@ -74,144 +61,11 @@ static void wav_teardown(pcm_reader_t **reader)
     *reader = 0;
 }
 
-static
-int riff_read(wav_reader_t *reader, void *buffer, uint32_t size)
-{
-    int rc;
-    uint32_t count = 0;
-
-    if (reader->last_error)
-        return -1;
-    do {
-        rc = reader->io.read(reader->io_cookie, buffer, size - count);
-        if (rc > 0)
-            count += rc;
-        else if (rc < 0)
-            reader->last_error = WAV_IO_ERROR;
-    } while (rc > 0 && count < size);
-    return count > 0 ? count : rc;
-}
-
-static
-int riff_skip(wav_reader_t *reader, int64_t count)
-{
-    char buff[8192];
-    int rc;
-
-    if (reader->last_error)
-        return -1;
-    if (count == 0)
-        return 0;
-    if (reader->io.seek &&
-        reader->io.seek(reader->io_cookie, count, SEEK_CUR) >= 0)
-        return 0;
-
-    do {
-        if ((rc = riff_read(reader, buff, count > 8192 ? 8192 : count)) > 0)
-            count -= rc;
-    } while (rc > 0 && count > 0);
-
-    if (count > 0)
-        reader->last_error = WAV_IO_ERROR;
-    return reader->last_error ? -1 : 0;
-}
-
-static
-int riff_seek(wav_reader_t *reader, int64_t off, int whence)
-{
-    int rc;
-    if (reader->last_error)
-        return -1;
-    if (!reader->io.seek)
-        goto FAIL;
-    if ((rc = reader->io.seek(reader->io_cookie, off, whence)) < 0)
-        goto FAIL;
-    return 0;
-FAIL:
-    reader->last_error = WAV_IO_ERROR;
-    return -1;
-}
-
-static
-int64_t riff_tell(wav_reader_t *reader)
-{
-    int64_t off;
-
-    if (reader->last_error || !reader->io.tell)
-        return -1;
-    off = reader->io.tell(reader->io_cookie);
-    if (off < 0) {
-        reader->last_error = WAV_IO_ERROR;
-        return -1;
-    }
-    return off;
-}
-
-static
-int riff_read16(wav_reader_t *reader, uint16_t *value)
-{
-    TRY_IO(riff_read(reader, value, 2) != 2);
-    *value = m4af_ltoh16(*value);
-    return 0;
-FAIL:
-    return -1;
-}
-
-static
-int riff_read32(wav_reader_t *reader, uint32_t *value)
-{
-    TRY_IO(riff_read(reader, value, 4) != 4);
-    *value = m4af_ltoh32(*value);
-    return 0;
-FAIL:
-    return -1;
-}
-
-static
-int riff_read64(wav_reader_t *reader, uint64_t *value)
-{
-    TRY_IO(riff_read(reader, value, 8) != 8);
-    *value = m4af_ltoh64(*value);
-    return 0;
-FAIL:
-    return -1;
-}
-
-static
-int riff_scan(wav_reader_t *reader, const char *fmt, ...)
-{
-    int c, count = 0;
-    va_list ap;
-
-    va_start(ap, fmt);
-    while ((c = *fmt++)) {
-        switch (c) {
-        case 'S':
-            TRY_IO(riff_read16(reader, va_arg(ap, uint16_t*)));
-            ++count;
-            break;
-        case 'L':
-            TRY_IO(riff_read32(reader, va_arg(ap, uint32_t*)));
-            ++count;
-            break;
-        case 'Q':
-            TRY_IO(riff_read64(reader, va_arg(ap, uint64_t*)));
-            ++count;
-            break;
-        }
-    }
-FAIL:
-    va_end(ap);
-    return count;
-}
-
 static
 uint32_t riff_next_chunk(wav_reader_t *reader, uint32_t *chunk_size)
 {
     uint32_t fcc;
-    if (riff_scan(reader, "LL", &fcc, chunk_size) == 2)
+    return (pcm_scanl(&reader->io, "LL", &fcc, chunk_size) == 2) ? fcc : 0;
-        return fcc;
-    return 0;
 }
 
 static
@@ -225,7 +79,7 @@ int wav_read_frames(pcm_reader_t *preader, void *buffer, unsigned nframes)
         nframes = reader->length - reader->position;
     nbytes = nframes * reader->sample_format.bytes_per_frame;
     if (nbytes) {
-        if ((rc = riff_read(reader, buffer, nbytes)) < 0)
+        if ((rc = pcm_read(&reader->io, buffer, nbytes)) < 0)
             return -1;
         nframes = rc / reader->sample_format.bytes_per_frame;
         reader->position += nframes;
@@ -240,11 +94,10 @@ int riff_ds64(wav_reader_t *reader, int64_t *length)
     uint64_t riff_size, sample_count;
 
     fcc = riff_next_chunk(reader, &chunk_size);
-    ASSERT_FORMAT(reader,
+    ENSURE(fcc == RIFF_FOURCC('d','s','6','4') && chunk_size >= 28);
-                  fcc == RIFF_FOURCC('d','s','6','4') && chunk_size >= 28);
+    TRY_IO(pcm_scanl(&reader->io, "QQQL",
-    TRY_IO(riff_scan(reader, "QQQL",
                      &riff_size, length, &sample_count, &table_size) != 4);
-    TRY_IO(riff_skip(reader, (chunk_size - 27) & ~1));
+    TRY_IO(pcm_skip(&reader->io, (chunk_size - 27) & ~1));
     reader->data_offset += (chunk_size + 9) & ~1;
 FAIL:
     return -1;
@@ -259,41 +112,34 @@ int wav_fmt(wav_reader_t *reader, uint32_t size)
     uint8_t guid[16];
     int is_float = 0;
 
-    ASSERT_FORMAT(reader, size >= 16);
+    ENSURE(size >= 16);
-    TRY_IO(riff_scan(reader, "SSLLSS", &wFormatTag, &nChannels,
+    TRY_IO(pcm_scanl(&reader->io, "SSLLSS", &wFormatTag, &nChannels,
                      &nSamplesPerSec, &nAvgBytesPerSec, &nBlockAlign,
                      &wBitsPerSample) != 6);
     wValidBitsPerSample = wBitsPerSample;
 
-    if (wFormatTag != 1 && wFormatTag != 3 && wFormatTag != 0xfffe) {
+    ENSURE(wFormatTag == 1 || wFormatTag == 3 || wFormatTag == 0xfffe);
-        reader->last_error = WAV_UNSUPPORTED_FORMAT;
+    ENSURE(nChannels && nSamplesPerSec && nAvgBytesPerSec &&
-        goto FAIL;
-    }
-    ASSERT_FORMAT(reader,
-                  nChannels && nSamplesPerSec && nAvgBytesPerSec &&
            nBlockAlign && wBitsPerSample && !(wBitsPerSample & 7) &&
            nBlockAlign == nChannels * wBitsPerSample / 8);
+
     if (wFormatTag == 3)
         is_float = 1;
 
     if (wFormatTag != 0xfffe)
-        TRY_IO(riff_skip(reader, (size - 15) & ~1));
+        TRY_IO(pcm_skip(&reader->io, (size - 15) & ~1));
     else {
-        ASSERT_FORMAT(reader, size >= 40);
+        ENSURE(size >= 40);
-        TRY_IO(riff_scan(reader, "SSL",
+        TRY_IO(pcm_scanl(&reader->io, "SSL",
                          &cbSize, &wValidBitsPerSample, &dwChannelMask) != 3);
-        TRY_IO(riff_read(reader, guid, 16) != 16);
+        TRY_IO(pcm_read(&reader->io, guid, 16) != 16);
 
         if (memcmp(guid, WAV_GUID_FLOAT, 16) == 0)
             is_float = 1;
-        else if (memcmp(guid, WAV_GUID_PCM, 16) != 0) {
+        else if (memcmp(guid, WAV_GUID_PCM, 16) != 0)
-            reader->last_error = WAV_UNSUPPORTED_FORMAT;
             goto FAIL;
-        }
+        ENSURE(wValidBitsPerSample && wValidBitsPerSample <= wBitsPerSample);
-        ASSERT_FORMAT(reader,
+        TRY_IO(pcm_skip(&reader->io, (size - 39) & ~1));
-                      wValidBitsPerSample &&
-                      wValidBitsPerSample <= wBitsPerSample);
-        TRY_IO(riff_skip(reader, (size - 39) & ~1));
     }
     reader->sample_format.sample_rate = nSamplesPerSec;
     reader->sample_format.bits_per_channel = wValidBitsPerSample;
@@ -318,12 +164,10 @@ int wav_parse(wav_reader_t *reader, int64_t *data_length)
 
     *data_length = 0;
     container = riff_next_chunk(reader, &chunk_size);
-    if (container != RIFF_FOURCC('R','I','F','F') &&
+    ENSURE(container == RIFF_FOURCC('R','I','F','F') ||
-        container != RIFF_FOURCC('R','F','6','4'))
+           container == RIFF_FOURCC('R','F','6','4'));
-        goto FAIL;
+    TRY_IO(pcm_read32le(&reader->io, &fcc));
-    TRY_IO(riff_read32(reader, &fcc));
+    ENSURE(fcc == RIFF_FOURCC('W','A','V','E'));
-    if (fcc != RIFF_FOURCC('W','A','V','E'))
-        goto FAIL;
     reader->data_offset = 12;
 
     if (container == RIFF_FOURCC('R','F','6','4'))
@@ -338,7 +182,7 @@ int wav_parse(wav_reader_t *reader, int64_t *data_length)
             reader->data_offset += 8;
             break;
         } else {
-            TRY_IO(riff_skip(reader, (chunk_size + 1) & ~1));
+            TRY_IO(pcm_skip(&reader->io, (chunk_size + 1) & ~1));
         }
         reader->data_offset += (chunk_size + 9) & ~1;
     }
@@ -356,8 +200,7 @@ static pcm_reader_vtbl_t wav_vtable = {
     wav_teardown
 };
 
-pcm_reader_t *wav_open(wav_io_context_t *io_ctx, void *io_cookie,
+pcm_reader_t *wav_open(pcm_io_context_t *io, int ignore_length)
-                       int ignore_length)
 {
     wav_reader_t *reader = 0;
     int64_t data_length;
@@ -365,8 +208,7 @@ pcm_reader_t *wav_open(wav_io_context_t *io_ctx, void *io_cookie,
 
     if ((reader = calloc(1, sizeof(wav_reader_t))) == 0)
         return 0;
-    memcpy(&reader->io, io_ctx, sizeof(wav_io_context_t));
+    memcpy(&reader->io, io, sizeof(pcm_io_context_t));
-    reader->io_cookie = io_cookie;
     reader->ignore_length = ignore_length;
     if (wav_parse(reader, &data_length) < 0) {
         free(reader);
@@ -378,39 +220,34 @@ pcm_reader_t *wav_open(wav_io_context_t *io_ctx, void *io_cookie,
     else
         reader->length = data_length / bpf;
 
-    if (reader->length == INT64_MAX && reader->io.seek && reader->io.tell) {
+    if (reader->length == INT64_MAX) {
-        if (reader->io.seek(reader->io_cookie, 0, SEEK_END) >= 0) {
+        if (pcm_seek(&reader->io, 0, SEEK_END) >= 0) {
-            int64_t size = reader->io.tell(reader->io_cookie);
+            int64_t size = pcm_tell(&reader->io);
             if (size > 0)
                 reader->length = (size - reader->data_offset) / bpf;
-            reader->io.seek(reader->io_cookie, reader->data_offset, SEEK_SET);
+            pcm_seek(&reader->io, reader->data_offset, SEEK_SET);
         }
     }
     reader->vtbl = &wav_vtable;
     return (pcm_reader_t *)reader;
 }
 
-pcm_reader_t *raw_open(wav_io_context_t *io_ctx, void *io_cookie,
+pcm_reader_t *raw_open(pcm_io_context_t *io,
                        const pcm_sample_description_t *desc)
 {
     wav_reader_t *reader = 0;
 
     if ((reader = calloc(1, sizeof(wav_reader_t))) == 0)
         return 0;
-    memcpy(&reader->io, io_ctx, sizeof(wav_io_context_t));
+    memcpy(&reader->io, io, sizeof(pcm_io_context_t));
     memcpy(&reader->sample_format, desc, sizeof(pcm_sample_description_t));
-    reader->io_cookie = io_cookie;
+    if (pcm_seek(&reader->io, 0, SEEK_END) >= 0) {
-    if (io_ctx->seek && io_ctx->tell) {
+        int64_t size = pcm_tell(&reader->io);
-        if (reader->io.seek(reader->io_cookie, 0, SEEK_END) >= 0) {
-            int64_t size = reader->io.tell(reader->io_cookie);
         if (size > 0)
-                reader->length = size / desc->bytes_per_frame;
+            reader->length = size / reader->sample_format.bytes_per_frame;
-            reader->io.seek(reader->io_cookie, reader->data_offset, SEEK_SET);
+        pcm_seek(&reader->io, 0, SEEK_SET);
-        }
     } else
         reader->length = INT64_MAX;
     reader->vtbl = &wav_vtable;
     return (pcm_reader_t *)reader;
 }
-
-

src/wav_reader.h

@@ -8,28 +8,10 @@
 #include "lpcm.h"
 #include "pcm_reader.h"
 
-enum wav_error_code {
-    WAV_IO_ERROR = 1,
-    WAV_NO_MEMORY,
-    WAV_INVALID_FORMAT,
-    WAV_UNSUPPORTED_FORMAT
-};
-
-typedef int (*wav_read_callback)(void *cookie, void *data, uint32_t size);
-typedef int (*wav_seek_callback)(void *cookie, int64_t off, int whence);
-typedef int64_t (*wav_tell_callback)(void *cookie);
-
-typedef struct wav_io_context_t {
-    wav_read_callback read;
-    wav_seek_callback seek;
-    wav_tell_callback tell;
-} wav_io_context_t;
-
 typedef struct wav_reader_t wav_reader_t;
 
-pcm_reader_t *wav_open(wav_io_context_t *io_ctx, void *io_cookie,
+pcm_reader_t *wav_open(pcm_io_context_t *io, int ignore_length);
-                       int ignore_length);
+pcm_reader_t *raw_open(pcm_io_context_t *io,
-pcm_reader_t *raw_open(wav_io_context_t *io_ctx, void *io_cookie,
                        const pcm_sample_description_t *desc);
 
 #endif