mirror of https://github.com/mpv-player/mpv.git
231 lines
6.4 KiB
C
231 lines
6.4 KiB
C
/*
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* PCM audio output driver
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*
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* Original author: Atmosfear
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*
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* This file is part of mpv.
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*
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* mpv is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* mpv 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
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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 "mpv_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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int append;
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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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uint16_t fmt = ao->format == AF_FORMAT_FLOAT ? WAV_ID_FLOAT_PCM : WAV_ID_PCM;
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int bits = af_fmt_to_bytes(ao->format) * 8;
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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 + 40 +
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// data chunk hdr (8) + data length
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fput32le(12 + 40 + 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(40, fp);
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fput16le(WAV_ID_FORMAT_EXTENSIBLE, 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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// 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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// 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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char *outputfilename = priv->outputfilename;
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if (!outputfilename) {
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outputfilename = talloc_strdup(priv, priv->waveheader ? "audiodump.wav"
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: "audiodump.pcm");
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}
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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_S32:
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case AF_FORMAT_FLOAT:
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break;
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default:
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if (!af_fmt_is_spdif(ao->format))
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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_fmt_to_bytes(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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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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priv->fp = fopen(outputfilename, priv->append ? "ab" : "wb");
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if (!priv->fp) {
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MP_ERR(ao, "Failed to open %s for writing!\n", 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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.reports_underruns = true, // not a thing
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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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{"file", OPT_STRING(outputfilename), .flags = M_OPT_FILE},
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{"waveheader", OPT_FLAG(waveheader)},
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{"append", OPT_FLAG(append)},
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{0}
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},
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.options_prefix = "ao-pcm",
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};
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