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https://github.com/mpv-player/mpv.git
synced 2024-09-20 12:02:23 +02:00
b745c2d005
Until now, the audio chain could handle both little endian and big endian formats. This actually doesn't make much sense, since the audio API and the HW will most likely prefer native formats. Or at the very least, it should be trivial for audio drivers to do the byte swapping themselves. From now on, the audio chain contains native-endian formats only. All AOs and some filters are adjusted. af_convertsignendian.c is now wrongly named, but the filter name is adjusted. In some cases, the audio infrastructure was reused on the demuxer side, but that is relatively easy to rectify. This is a quite intrusive and radical change. It's possible that it will break some things (especially if they're obscure or not Linux), so watch out for regressions. It's probably still better to do it the bulldozer way, since slow transition and researching foreign platforms would take a lot of time and effort.
233 lines
6.6 KiB
C
233 lines
6.6 KiB
C
/*
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* PCM audio output driver
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*
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* This file is part of MPlayer.
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*
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* Original author: Atmosfear
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*
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* MPlayer is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* MPlayer is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with MPlayer; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <libavutil/common.h>
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#include "talloc.h"
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#include "options/m_option.h"
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#include "audio/format.h"
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#include "ao.h"
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#include "internal.h"
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#include "common/msg.h"
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#include "osdep/endian.h"
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#ifdef __MINGW32__
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// for GetFileType to detect pipes
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#include <windows.h>
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#include <io.h>
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#endif
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struct priv {
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char *outputfilename;
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int waveheader;
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uint64_t data_length;
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FILE *fp;
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};
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#define WAV_ID_RIFF 0x46464952 /* "RIFF" */
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#define WAV_ID_WAVE 0x45564157 /* "WAVE" */
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#define WAV_ID_FMT 0x20746d66 /* "fmt " */
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#define WAV_ID_DATA 0x61746164 /* "data" */
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#define WAV_ID_PCM 0x0001
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#define WAV_ID_FLOAT_PCM 0x0003
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#define WAV_ID_FORMAT_EXTENSIBLE 0xfffe
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static void fput16le(uint16_t val, FILE *fp)
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{
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uint8_t bytes[2] = {val, val >> 8};
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fwrite(bytes, 1, 2, fp);
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}
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static void fput32le(uint32_t val, FILE *fp)
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{
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uint8_t bytes[4] = {val, val >> 8, val >> 16, val >> 24};
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fwrite(bytes, 1, 4, fp);
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}
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static void write_wave_header(struct ao *ao, FILE *fp, uint64_t data_length)
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{
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bool use_waveex = true;
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uint16_t fmt = ao->format == AF_FORMAT_FLOAT ? WAV_ID_FLOAT_PCM : WAV_ID_PCM;
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uint32_t fmt_chunk_size = use_waveex ? 40 : 16;
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int bits = af_fmt2bits(ao->format);
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// Master RIFF chunk
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fput32le(WAV_ID_RIFF, fp);
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// RIFF chunk size: 'WAVE' + 'fmt ' + 4 + fmt_chunk_size +
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// data chunk hdr (8) + data length
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fput32le(12 + fmt_chunk_size + 8 + data_length, fp);
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fput32le(WAV_ID_WAVE, fp);
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// Format chunk
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fput32le(WAV_ID_FMT, fp);
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fput32le(fmt_chunk_size, fp);
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fput16le(use_waveex ? WAV_ID_FORMAT_EXTENSIBLE : fmt, fp);
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fput16le(ao->channels.num, fp);
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fput32le(ao->samplerate, fp);
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fput32le(ao->bps, fp);
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fput16le(ao->channels.num * (bits / 8), fp);
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fput16le(bits, fp);
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if (use_waveex) {
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// Extension chunk
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fput16le(22, fp);
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fput16le(bits, fp);
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fput32le(mp_chmap_to_waveext(&ao->channels), fp);
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// 2 bytes format + 14 bytes guid
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fput32le(fmt, fp);
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fput32le(0x00100000, fp);
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fput32le(0xAA000080, fp);
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fput32le(0x719B3800, fp);
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}
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// Data chunk
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fput32le(WAV_ID_DATA, fp);
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fput32le(data_length, fp);
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}
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static int init(struct ao *ao)
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{
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struct priv *priv = ao->priv;
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if (!priv->outputfilename)
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priv->outputfilename =
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talloc_strdup(priv, priv->waveheader ? "audiodump.wav" : "audiodump.pcm");
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ao->format = af_fmt_from_planar(ao->format);
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if (priv->waveheader) {
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// WAV files must have one of the following formats
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// And they don't work in big endian; fixing it would be simple, but
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// nobody cares.
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if (BYTE_ORDER == BIG_ENDIAN) {
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MP_FATAL(ao, "Not supported on big endian.\n");
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return -1;
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}
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switch (ao->format) {
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case AF_FORMAT_U8:
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case AF_FORMAT_S16:
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case AF_FORMAT_S24:
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case AF_FORMAT_S32:
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case AF_FORMAT_FLOAT:
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case AF_FORMAT_AC3:
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break;
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default:
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ao->format = AF_FORMAT_S16;
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break;
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}
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}
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struct mp_chmap_sel sel = {0};
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mp_chmap_sel_add_waveext(&sel);
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if (!ao_chmap_sel_adjust(ao, &sel, &ao->channels))
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return -1;
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ao->bps = ao->channels.num * ao->samplerate * af_fmt2bps(ao->format);
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MP_INFO(ao, "File: %s (%s)\nPCM: Samplerate: %d Hz Channels: %d Format: %s\n",
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priv->outputfilename,
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priv->waveheader ? "WAVE" : "RAW PCM", ao->samplerate,
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ao->channels.num, af_fmt_to_str(ao->format));
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MP_INFO(ao, "Info: Faster dumping is achieved with --no-video\n");
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MP_INFO(ao, "Info: To write WAVE files use --ao=pcm:waveheader (default).\n");
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priv->fp = fopen(priv->outputfilename, "wb");
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if (!priv->fp) {
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MP_ERR(ao, "Failed to open %s for writing!\n", priv->outputfilename);
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return -1;
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}
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if (priv->waveheader) // Reserve space for wave header
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write_wave_header(ao, priv->fp, 0x7ffff000);
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ao->untimed = true;
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return 0;
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}
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// close audio device
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static void uninit(struct ao *ao)
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{
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struct priv *priv = ao->priv;
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if (priv->waveheader) { // Rewrite wave header
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bool broken_seek = false;
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#ifdef __MINGW32__
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// Windows, in its usual idiocy "emulates" seeks on pipes so it always
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// looks like they work. So we have to detect them brute-force.
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broken_seek = FILE_TYPE_DISK !=
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GetFileType((HANDLE)_get_osfhandle(_fileno(priv->fp)));
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#endif
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if (broken_seek || fseek(priv->fp, 0, SEEK_SET) != 0)
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MP_ERR(ao, "Could not seek to start, WAV size headers not updated!\n");
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else {
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if (priv->data_length > 0xfffff000) {
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MP_ERR(ao, "File larger than allowed for "
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"WAV files, may play truncated!\n");
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priv->data_length = 0xfffff000;
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}
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write_wave_header(ao, priv->fp, priv->data_length);
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}
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}
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fclose(priv->fp);
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}
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static int get_space(struct ao *ao)
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{
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return 65536;
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}
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static int play(struct ao *ao, void **data, int samples, int flags)
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{
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struct priv *priv = ao->priv;
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int len = samples * ao->sstride;
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fwrite(data[0], len, 1, priv->fp);
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priv->data_length += len;
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return samples;
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}
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#define OPT_BASE_STRUCT struct priv
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const struct ao_driver audio_out_pcm = {
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.description = "RAW PCM/WAVE file writer audio output",
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.name = "pcm",
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.init = init,
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.uninit = uninit,
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.get_space = get_space,
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.play = play,
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.priv_size = sizeof(struct priv),
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.priv_defaults = &(const struct priv) { .waveheader = 1 },
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.options = (const struct m_option[]) {
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OPT_STRING("file", outputfilename, 0),
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OPT_FLAG("waveheader", waveheader, 0),
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{0}
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},
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};
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