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/*
* PCM audio output driver
*
* Original author: Atmosfear
*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* mpv is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libavutil/common.h>
#include "mpv_talloc.h"
#include "options/m_option.h"
#include "audio/format.h"
#include "ao.h"
#include "internal.h"
#include "common/msg.h"
#include "osdep/endian.h"
#ifdef __MINGW32__
// for GetFileType to detect pipes
#include <windows.h>
#include <io.h>
#endif
struct priv {
char *outputfilename;
int waveheader;
int append;
uint64_t data_length;
FILE *fp;
};
#define WAV_ID_RIFF 0x46464952 /* "RIFF" */
#define WAV_ID_WAVE 0x45564157 /* "WAVE" */
#define WAV_ID_FMT 0x20746d66 /* "fmt " */
#define WAV_ID_DATA 0x61746164 /* "data" */
#define WAV_ID_PCM 0x0001
#define WAV_ID_FLOAT_PCM 0x0003
#define WAV_ID_FORMAT_EXTENSIBLE 0xfffe
static void fput16le(uint16_t val, FILE *fp)
{
uint8_t bytes[2] = {val, val >> 8};
fwrite(bytes, 1, 2, fp);
}
static void fput32le(uint32_t val, FILE *fp)
{
uint8_t bytes[4] = {val, val >> 8, val >> 16, val >> 24};
fwrite(bytes, 1, 4, fp);
}
static void write_wave_header(struct ao *ao, FILE *fp, uint64_t data_length)
{
uint16_t fmt = ao->format == AF_FORMAT_FLOAT ? WAV_ID_FLOAT_PCM : WAV_ID_PCM;
int bits = af_fmt_to_bytes(ao->format) * 8;
// Master RIFF chunk
fput32le(WAV_ID_RIFF, fp);
// RIFF chunk size: 'WAVE' + 'fmt ' + 4 + 40 +
// data chunk hdr (8) + data length
fput32le(12 + 40 + 8 + data_length, fp);
fput32le(WAV_ID_WAVE, fp);
// Format chunk
fput32le(WAV_ID_FMT, fp);
fput32le(40, fp);
fput16le(WAV_ID_FORMAT_EXTENSIBLE, fp);
fput16le(ao->channels.num, fp);
fput32le(ao->samplerate, fp);
fput32le(ao->bps, fp);
fput16le(ao->channels.num * (bits / 8), fp);
fput16le(bits, fp);
// Extension chunk
fput16le(22, fp);
fput16le(bits, fp);
fput32le(mp_chmap_to_waveext(&ao->channels), fp);
// 2 bytes format + 14 bytes guid
fput32le(fmt, fp);
fput32le(0x00100000, fp);
fput32le(0xAA000080, fp);
fput32le(0x719B3800, fp);
// Data chunk
fput32le(WAV_ID_DATA, fp);
fput32le(data_length, fp);
}
static int init(struct ao *ao)
{
struct priv *priv = ao->priv;
if (!priv->outputfilename)
priv->outputfilename =
talloc_strdup(priv, priv->waveheader ? "audiodump.wav" : "audiodump.pcm");
ao->format = af_fmt_from_planar(ao->format);
if (priv->waveheader) {
// WAV files must have one of the following formats
// And they don't work in big endian; fixing it would be simple, but
// nobody cares.
if (BYTE_ORDER == BIG_ENDIAN) {
MP_FATAL(ao, "Not supported on big endian.\n");
return -1;
}
switch (ao->format) {
case AF_FORMAT_U8:
case AF_FORMAT_S16:
case AF_FORMAT_S24:
case AF_FORMAT_S32:
case AF_FORMAT_FLOAT:
break;
default:
if (!af_fmt_is_spdif(ao->format))
ao->format = AF_FORMAT_S16;
break;
}
}
struct mp_chmap_sel sel = {0};
mp_chmap_sel_add_waveext(&sel);
if (!ao_chmap_sel_adjust(ao, &sel, &ao->channels))
return -1;
ao->bps = ao->channels.num * ao->samplerate * af_fmt_to_bytes(ao->format);
MP_INFO(ao, "File: %s (%s)\nPCM: Samplerate: %d Hz Channels: %d Format: %s\n",
priv->outputfilename,
priv->waveheader ? "WAVE" : "RAW PCM", ao->samplerate,
ao->channels.num, af_fmt_to_str(ao->format));
MP_INFO(ao, "Info: Faster dumping is achieved with --no-video\n");
MP_INFO(ao, "Info: To write WAVE files use --ao=pcm:waveheader (default).\n");
priv->fp = fopen(priv->outputfilename, priv->append ? "ab" : "wb");
if (!priv->fp) {
MP_ERR(ao, "Failed to open %s for writing!\n", priv->outputfilename);
return -1;
}
if (priv->waveheader) // Reserve space for wave header
write_wave_header(ao, priv->fp, 0x7ffff000);
ao->untimed = true;
return 0;
}
// close audio device
static void uninit(struct ao *ao)
{
struct priv *priv = ao->priv;
if (priv->waveheader) { // Rewrite wave header
bool broken_seek = false;
#ifdef __MINGW32__
// Windows, in its usual idiocy "emulates" seeks on pipes so it always
// looks like they work. So we have to detect them brute-force.
broken_seek = FILE_TYPE_DISK !=
GetFileType((HANDLE)_get_osfhandle(_fileno(priv->fp)));
#endif
if (broken_seek || fseek(priv->fp, 0, SEEK_SET) != 0)
MP_ERR(ao, "Could not seek to start, WAV size headers not updated!\n");
else {
if (priv->data_length > 0xfffff000) {
MP_ERR(ao, "File larger than allowed for "
"WAV files, may play truncated!\n");
priv->data_length = 0xfffff000;
}
write_wave_header(ao, priv->fp, priv->data_length);
}
}
fclose(priv->fp);
}
static int get_space(struct ao *ao)
{
return 65536;
}
static int play(struct ao *ao, void **data, int samples, int flags)
{
struct priv *priv = ao->priv;
int len = samples * ao->sstride;
fwrite(data[0], len, 1, priv->fp);
priv->data_length += len;
return samples;
}
#define OPT_BASE_STRUCT struct priv
const struct ao_driver audio_out_pcm = {
.description = "RAW PCM/WAVE file writer audio output",
.name = "pcm",
.init = init,
.uninit = uninit,
.get_space = get_space,
.play = play,
.priv_size = sizeof(struct priv),
.priv_defaults = &(const struct priv) { .waveheader = 1 },
.options = (const struct m_option[]) {
OPT_STRING("file", outputfilename, 0),
OPT_FLAG("waveheader", waveheader, 0),
OPT_FLAG("append", append, 0),
{0}
},
};
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