src/wav_reader.c

   1 /*
   2  * Copyright (C) 2013 nu774
   3  * For conditions of distribution and use, see copyright notice in COPYING
   4  */
   5 #if HAVE_CONFIG_H
   6 #  include "config.h"
   7 #endif
   8
   9 #if HAVE_STDINT_H
  10 #  include <stdint.h>
  11 #endif
  12
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <string.h>
  16 #include <stdarg.h>
  17 #include "wav_reader.h"
  18
  19 #define RIFF_FOURCC(a,b,c,d) ((a)|((b)<<8)|((c)<<16)|((d)<<24))
  20
  21 typedef struct wav_reader_t {
  22     pcm_reader_vtbl_t *vtbl;
  23     pcm_sample_description_t sample_format;
  24     int64_t length;
  25     int64_t position;
  26     int32_t data_offset;
  27     int ignore_length;
  28     pcm_io_context_t io;
  29 } wav_reader_t;
  30
  31 static const uint8_t WAV_GUID_PCM[] = {
  32     1, 0, 0, 0, 0, 0, 0x10, 0, 0x80, 0, 0, 0xaa, 0, 0x38, 0x9b, 0x71
  33 };
  34 static const uint8_t WAV_GUID_FLOAT[] = {
  35     3, 0, 0, 0, 0, 0, 0x10, 0, 0x80, 0, 0, 0xaa, 0, 0x38, 0x9b, 0x71
  36 };
  37
  38 static const pcm_sample_description_t *wav_get_format(pcm_reader_t *reader)
  39 {
  40     return &((wav_reader_t *)reader)->sample_format;
  41 }
  42
  43 static int64_t wav_get_length(pcm_reader_t *reader)
  44 {
  45     return ((wav_reader_t *)reader)->length;
  46 }
  47
  48 static int64_t wav_get_position(pcm_reader_t *reader)
  49 {
  50     return ((wav_reader_t *)reader)->position;
  51 }
  52
  53 static void wav_teardown(pcm_reader_t **reader)
  54 {
  55     free(*reader);
  56     *reader = 0;
  57 }
  58
  59 static
  60 uint32_t riff_next_chunk(wav_reader_t *reader, uint32_t *chunk_size)
  61 {
  62     uint32_t fcc;
  63     return (pcm_scanl(&reader->io, "LL", &fcc, chunk_size) == 2) ? fcc : 0;
  64 }
  65
  66 static
  67 int wav_read_frames(pcm_reader_t *preader, void *buffer, unsigned nframes)
  68 {
  69     int rc;
  70     unsigned nbytes;
  71     wav_reader_t *reader = (wav_reader_t *)preader;
  72
  73     if (!reader->ignore_length && nframes > reader->length - reader->position)
  74         nframes = reader->length - reader->position;
  75     nbytes = nframes * reader->sample_format.bytes_per_frame;
  76     if (nbytes) {
  77         if ((rc = pcm_read(&reader->io, buffer, nbytes)) < 0)
  78             return -1;
  79         nframes = rc / reader->sample_format.bytes_per_frame;
  80         reader->position += nframes;
  81     }
  82     return nframes;
  83 }
  84
  85 static
  86 int riff_ds64(wav_reader_t *reader, int64_t *length)
  87 {
  88     uint32_t fcc, chunk_size, table_size;
  89     uint64_t riff_size, sample_count;
  90
  91     fcc = riff_next_chunk(reader, &chunk_size);
  92     ENSURE(fcc == RIFF_FOURCC('d','s','6','4') && chunk_size >= 28);
  93     TRY_IO(pcm_scanl(&reader->io, "QQQL",
  94                      &riff_size, length, &sample_count, &table_size) != 4);
  95     TRY_IO(pcm_skip(&reader->io, (chunk_size - 27) & ~1));
  96 FAIL:
  97     return -1;
  98 }
  99
 100 static
 101 int wav_fmt(wav_reader_t *reader, uint32_t size)
 102 {
 103     uint16_t wFormatTag, nChannels, nBlockAlign, wBitsPerSample, cbSize;
 104     uint32_t nSamplesPerSec, nAvgBytesPerSec, dwChannelMask = 0;
 105     uint16_t wValidBitsPerSample;
 106     uint8_t guid[16];
 107     int is_float = 0;
 108
 109     ENSURE(size >= 16);
 110     TRY_IO(pcm_scanl(&reader->io, "SSLLSS", &wFormatTag, &nChannels,
 111                      &nSamplesPerSec, &nAvgBytesPerSec, &nBlockAlign,
 112                      &wBitsPerSample) != 6);
 113     wValidBitsPerSample = wBitsPerSample;
 114
 115     ENSURE(wFormatTag == 1 || wFormatTag == 3 || wFormatTag == 0xfffe);
 116     ENSURE(nChannels && nSamplesPerSec && nAvgBytesPerSec &&
 117            nBlockAlign && wBitsPerSample && !(wBitsPerSample & 7) &&
 118            nBlockAlign == nChannels * wBitsPerSample / 8);
 119
 120     if (wFormatTag == 3)
 121         is_float = 1;
 122
 123     if (wFormatTag != 0xfffe)
 124         TRY_IO(pcm_skip(&reader->io, (size - 15) & ~1));
 125     else {
 126         ENSURE(size >= 40);
 127         TRY_IO(pcm_scanl(&reader->io, "SSL",
 128                          &cbSize, &wValidBitsPerSample, &dwChannelMask) != 3);
 129         TRY_IO(pcm_read(&reader->io, guid, 16) != 16);
 130
 131         if (memcmp(guid, WAV_GUID_FLOAT, 16) == 0)
 132             is_float = 1;
 133         else if (memcmp(guid, WAV_GUID_PCM, 16) != 0)
 134             goto FAIL;
 135         ENSURE(wValidBitsPerSample && wValidBitsPerSample <= wBitsPerSample);
 136         TRY_IO(pcm_skip(&reader->io, (size - 39) & ~1));
 137     }
 138     reader->sample_format.sample_rate = nSamplesPerSec;
 139     reader->sample_format.bits_per_channel = wValidBitsPerSample;
 140     reader->sample_format.bytes_per_frame = nBlockAlign;
 141     reader->sample_format.channels_per_frame = nChannels;
 142     reader->sample_format.channel_mask = dwChannelMask;
 143     if (is_float)
 144         reader->sample_format.sample_type = PCM_TYPE_FLOAT;
 145     else if (wBitsPerSample == 8)
 146         reader->sample_format.sample_type = PCM_TYPE_UINT;
 147     else
 148         reader->sample_format.sample_type = PCM_TYPE_SINT;
 149     return 0;
 150 FAIL:
 151     return -1;
 152 }
 153
 154 static
 155 int wav_parse(wav_reader_t *reader, int64_t *data_length)
 156 {
 157     uint32_t container, fcc, chunk_size;
 158
 159     *data_length = 0;
 160     container = riff_next_chunk(reader, &chunk_size);
 161     ENSURE(container == RIFF_FOURCC('R','I','F','F') ||
 162            container == RIFF_FOURCC('R','F','6','4'));
 163     TRY_IO(pcm_read32le(&reader->io, &fcc));
 164     ENSURE(fcc == RIFF_FOURCC('W','A','V','E'));
 165
 166     if (container == RIFF_FOURCC('R','F','6','4'))
 167         riff_ds64(reader, data_length);
 168     while ((fcc = riff_next_chunk(reader, &chunk_size)) != 0) {
 169         if (fcc == RIFF_FOURCC('f','m','t',' ')) {
 170             if (wav_fmt(reader, chunk_size) < 0)
 171                 goto FAIL;
 172         } else if (fcc == RIFF_FOURCC('d','a','t','a')) {
 173             if (container == RIFF_FOURCC('R','I','F','F'))
 174                 *data_length = chunk_size;
 175             reader->data_offset = pcm_tell(&reader->io);
 176             break;
 177         } else {
 178             TRY_IO(pcm_skip(&reader->io, (chunk_size + 1) & ~1));
 179         }
 180     }
 181     if (fcc == RIFF_FOURCC('d','a','t','a'))
 182         return 0;
 183 FAIL:
 184     return -1;
 185 }
 186
 187 static pcm_reader_vtbl_t wav_vtable = {
 188     wav_get_format,
 189     wav_get_length,
 190     wav_get_position,
 191     wav_read_frames,
 192     wav_teardown
 193 };
 194
 195 pcm_reader_t *wav_open(pcm_io_context_t *io, int ignore_length)
 196 {
 197     wav_reader_t *reader = 0;
 198     int64_t data_length;
 199     unsigned bpf;
 200
 201     if ((reader = calloc(1, sizeof(wav_reader_t))) == 0)
 202         return 0;
 203     memcpy(&reader->io, io, sizeof(pcm_io_context_t));
 204     reader->ignore_length = ignore_length;
 205     if (wav_parse(reader, &data_length) < 0) {
 206         free(reader);
 207         return 0;
 208     }
 209     bpf = reader->sample_format.bytes_per_frame;
 210     if (ignore_length || !data_length || data_length % bpf)
 211         reader->length = INT64_MAX;
 212     else
 213         reader->length = data_length / bpf;
 214
 215     if (reader->length == INT64_MAX) {
 216         if (pcm_seek(&reader->io, 0, SEEK_END) >= 0) {
 217             int64_t size = pcm_tell(&reader->io);
 218             if (size > 0)
 219                 reader->length = (size - reader->data_offset) / bpf;
 220             pcm_seek(&reader->io, reader->data_offset, SEEK_SET);
 221         }
 222     }
 223     reader->vtbl = &wav_vtable;
 224     return (pcm_reader_t *)reader;
 225 }
 226
 227 pcm_reader_t *raw_open(pcm_io_context_t *io,
 228                        const pcm_sample_description_t *desc)
 229 {
 230     wav_reader_t *reader = 0;
 231
 232     if ((reader = calloc(1, sizeof(wav_reader_t))) == 0)
 233         return 0;
 234     memcpy(&reader->io, io, sizeof(pcm_io_context_t));
 235     memcpy(&reader->sample_format, desc, sizeof(pcm_sample_description_t));
 236     if (pcm_seek(&reader->io, 0, SEEK_END) >= 0) {
 237         int64_t size = pcm_tell(&reader->io);
 238         if (size > 0)
 239             reader->length = size / reader->sample_format.bytes_per_frame;
 240         pcm_seek(&reader->io, 0, SEEK_SET);
 241     } else
 242         reader->length = INT64_MAX;
 243     reader->vtbl = &wav_vtable;
 244     return (pcm_reader_t *)reader;
 245 }