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      1 /* tinyplay.c
      2 **
      3 ** Copyright 2011, The Android Open Source Project
      4 **
      5 ** Redistribution and use in source and binary forms, with or without
      6 ** modification, are permitted provided that the following conditions are met:
      7 **     * Redistributions of source code must retain the above copyright
      8 **       notice, this list of conditions and the following disclaimer.
      9 **     * Redistributions in binary form must reproduce the above copyright
     10 **       notice, this list of conditions and the following disclaimer in the
     11 **       documentation and/or other materials provided with the distribution.
     12 **     * Neither the name of The Android Open Source Project nor the names of
     13 **       its contributors may be used to endorse or promote products derived
     14 **       from this software without specific prior written permission.
     15 **
     16 ** THIS SOFTWARE IS PROVIDED BY The Android Open Source Project ``AS IS'' AND
     17 ** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18 ** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     19 ** ARE DISCLAIMED. IN NO EVENT SHALL The Android Open Source Project BE LIABLE
     20 ** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21 ** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     22 ** SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
     23 ** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     24 ** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25 ** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
     26 ** DAMAGE.
     27 */
     28 
     29 #include <tinyalsa/asoundlib.h>
     30 #include <stdio.h>
     31 #include <stdlib.h>
     32 #include <stdint.h>
     33 #include <string.h>
     34 #include <signal.h>
     35 #include <endian.h>
     36 
     37 #define ID_RIFF 0x46464952
     38 #define ID_WAVE 0x45564157
     39 #define ID_FMT  0x20746d66
     40 #define ID_DATA 0x61746164
     41 
     42 struct riff_wave_header {
     43     uint32_t riff_id;
     44     uint32_t riff_sz;
     45     uint32_t wave_id;
     46 };
     47 
     48 struct chunk_header {
     49     uint32_t id;
     50     uint32_t sz;
     51 };
     52 
     53 struct chunk_fmt {
     54     uint16_t audio_format;
     55     uint16_t num_channels;
     56     uint32_t sample_rate;
     57     uint32_t byte_rate;
     58     uint16_t block_align;
     59     uint16_t bits_per_sample;
     60 };
     61 
     62 static int close = 0;
     63 
     64 void play_sample(FILE *file, unsigned int card, unsigned int device, unsigned int channels,
     65                  unsigned int rate, unsigned int bits, unsigned int period_size,
     66                  unsigned int period_count, uint32_t data_sz);
     67 
     68 void stream_close(int sig)
     69 {
     70     /* allow the stream to be closed gracefully */
     71     signal(sig, SIG_IGN);
     72     close = 1;
     73 }
     74 
     75 int main(int argc, char **argv)
     76 {
     77     FILE *file;
     78     struct riff_wave_header riff_wave_header;
     79     struct chunk_header chunk_header;
     80     struct chunk_fmt chunk_fmt;
     81     unsigned int device = 0;
     82     unsigned int card = 0;
     83     unsigned int period_size = 1024;
     84     unsigned int period_count = 4;
     85     char *filename;
     86     int more_chunks = 1;
     87 
     88     if (argc < 2) {
     89         fprintf(stderr, "Usage: %s file.wav [-D card] [-d device] [-p period_size]"
     90                 " [-n n_periods] \n", argv[0]);
     91         return 1;
     92     }
     93 
     94     filename = argv[1];
     95     file = fopen(filename, "rb");
     96     if (!file) {
     97         fprintf(stderr, "Unable to open file '%s'\n", filename);
     98         return 1;
     99     }
    100 
    101     fread(&riff_wave_header, sizeof(riff_wave_header), 1, file);
    102     if ((riff_wave_header.riff_id != ID_RIFF) ||
    103         (riff_wave_header.wave_id != ID_WAVE)) {
    104         fprintf(stderr, "Error: '%s' is not a riff/wave file\n", filename);
    105         fclose(file);
    106         return 1;
    107     }
    108 
    109     do {
    110         fread(&chunk_header, sizeof(chunk_header), 1, file);
    111 
    112         switch (chunk_header.id) {
    113         case ID_FMT:
    114             fread(&chunk_fmt, sizeof(chunk_fmt), 1, file);
    115             /* If the format header is larger, skip the rest */
    116             if (chunk_header.sz > sizeof(chunk_fmt))
    117                 fseek(file, chunk_header.sz - sizeof(chunk_fmt), SEEK_CUR);
    118             break;
    119         case ID_DATA:
    120             /* Stop looking for chunks */
    121             more_chunks = 0;
    122             chunk_header.sz = le32toh(chunk_header.sz);
    123             break;
    124         default:
    125             /* Unknown chunk, skip bytes */
    126             fseek(file, chunk_header.sz, SEEK_CUR);
    127         }
    128     } while (more_chunks);
    129 
    130     /* parse command line arguments */
    131     argv += 2;
    132     while (*argv) {
    133         if (strcmp(*argv, "-d") == 0) {
    134             argv++;
    135             if (*argv)
    136                 device = atoi(*argv);
    137         }
    138         if (strcmp(*argv, "-p") == 0) {
    139             argv++;
    140             if (*argv)
    141                 period_size = atoi(*argv);
    142         }
    143         if (strcmp(*argv, "-n") == 0) {
    144             argv++;
    145             if (*argv)
    146                 period_count = atoi(*argv);
    147         }
    148         if (strcmp(*argv, "-D") == 0) {
    149             argv++;
    150             if (*argv)
    151                 card = atoi(*argv);
    152         }
    153         if (*argv)
    154             argv++;
    155     }
    156 
    157     play_sample(file, card, device, chunk_fmt.num_channels, chunk_fmt.sample_rate,
    158                 chunk_fmt.bits_per_sample, period_size, period_count, chunk_header.sz);
    159 
    160     fclose(file);
    161 
    162     return 0;
    163 }
    164 
    165 int check_param(struct pcm_params *params, unsigned int param, unsigned int value,
    166                  char *param_name, char *param_unit)
    167 {
    168     unsigned int min;
    169     unsigned int max;
    170     int is_within_bounds = 1;
    171 
    172     min = pcm_params_get_min(params, param);
    173     if (value < min) {
    174         fprintf(stderr, "%s is %u%s, device only supports >= %u%s\n", param_name, value,
    175                 param_unit, min, param_unit);
    176         is_within_bounds = 0;
    177     }
    178 
    179     max = pcm_params_get_max(params, param);
    180     if (value > max) {
    181         fprintf(stderr, "%s is %u%s, device only supports <= %u%s\n", param_name, value,
    182                 param_unit, max, param_unit);
    183         is_within_bounds = 0;
    184     }
    185 
    186     return is_within_bounds;
    187 }
    188 
    189 int sample_is_playable(unsigned int card, unsigned int device, unsigned int channels,
    190                         unsigned int rate, unsigned int bits, unsigned int period_size,
    191                         unsigned int period_count)
    192 {
    193     struct pcm_params *params;
    194     int can_play;
    195 
    196     params = pcm_params_get(card, device, PCM_OUT);
    197     if (params == NULL) {
    198         fprintf(stderr, "Unable to open PCM device %u.\n", device);
    199         return 0;
    200     }
    201 
    202     can_play = check_param(params, PCM_PARAM_RATE, rate, "Sample rate", "Hz");
    203     can_play &= check_param(params, PCM_PARAM_CHANNELS, channels, "Sample", " channels");
    204     can_play &= check_param(params, PCM_PARAM_SAMPLE_BITS, bits, "Bitrate", " bits");
    205     can_play &= check_param(params, PCM_PARAM_PERIOD_SIZE, period_size, "Period size", " frames");
    206     can_play &= check_param(params, PCM_PARAM_PERIODS, period_count, "Period count", " periods");
    207 
    208     pcm_params_free(params);
    209 
    210     return can_play;
    211 }
    212 
    213 void play_sample(FILE *file, unsigned int card, unsigned int device, unsigned int channels,
    214                  unsigned int rate, unsigned int bits, unsigned int period_size,
    215                  unsigned int period_count, uint32_t data_sz)
    216 {
    217     struct pcm_config config;
    218     struct pcm *pcm;
    219     char *buffer;
    220     unsigned int size, read_sz;
    221     int num_read;
    222 
    223     memset(&config, 0, sizeof(config));
    224     config.channels = channels;
    225     config.rate = rate;
    226     config.period_size = period_size;
    227     config.period_count = period_count;
    228     if (bits == 32)
    229         config.format = PCM_FORMAT_S32_LE;
    230     else if (bits == 24)
    231         config.format = PCM_FORMAT_S24_3LE;
    232     else if (bits == 16)
    233         config.format = PCM_FORMAT_S16_LE;
    234     config.start_threshold = 0;
    235     config.stop_threshold = 0;
    236     config.silence_threshold = 0;
    237 
    238     if (!sample_is_playable(card, device, channels, rate, bits, period_size, period_count)) {
    239         return;
    240     }
    241 
    242     pcm = pcm_open(card, device, PCM_OUT, &config);
    243     if (!pcm || !pcm_is_ready(pcm)) {
    244         fprintf(stderr, "Unable to open PCM device %u (%s)\n",
    245                 device, pcm_get_error(pcm));
    246         return;
    247     }
    248 
    249     size = pcm_frames_to_bytes(pcm, pcm_get_buffer_size(pcm));
    250     buffer = malloc(size);
    251     if (!buffer) {
    252         fprintf(stderr, "Unable to allocate %d bytes\n", size);
    253         free(buffer);
    254         pcm_close(pcm);
    255         return;
    256     }
    257 
    258     printf("Playing sample: %u ch, %u hz, %u bit %u bytes\n", channels, rate, bits, data_sz);
    259 
    260     /* catch ctrl-c to shutdown cleanly */
    261     signal(SIGINT, stream_close);
    262 
    263     do {
    264         read_sz = size < data_sz ? size : data_sz;
    265         num_read = fread(buffer, 1, read_sz, file);
    266         if (num_read > 0) {
    267             if (pcm_write(pcm, buffer, num_read)) {
    268                 fprintf(stderr, "Error playing sample\n");
    269                 break;
    270             }
    271             data_sz -= num_read;
    272         }
    273     } while (!close && num_read > 0 && data_sz > 0);
    274 
    275     free(buffer);
    276     pcm_close(pcm);
    277 }
    278 
    279