mirror of https://github.com/mpv-player/mpv
257 lines
7.5 KiB
C
257 lines
7.5 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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* 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 "core/subopt-helper.h"
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#include "audio/format.h"
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#include "audio/reorder_ch.h"
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#include "ao.h"
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#include "core/mp_msg.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 = ao->channels >= 5 && ao->channels <= 8;
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uint16_t fmt = ao->format == AF_FORMAT_FLOAT_LE ?
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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, fp);
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fput32le(ao->samplerate, fp);
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fput32le(ao->bps, fp);
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fput16le(ao->channels * (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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switch (ao->channels) {
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case 5:
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fput32le(0x0607, fp); // L R C Lb Rb
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break;
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case 6:
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fput32le(0x060f, fp); // L R C Lb Rb LFE
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break;
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case 7:
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fput32le(0x0727, fp); // L R C Cb Ls Rs LFE
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break;
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case 8:
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fput32le(0x063f, fp); // L R C Lb Rb Ls Rs LFE
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break;
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}
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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, char *params)
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{
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struct priv *priv = talloc_zero(ao, struct priv);
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ao->priv = priv;
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int fast = 0;
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const opt_t subopts[] = {
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{"waveheader", OPT_ARG_BOOL, &priv->waveheader, NULL},
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{"file", OPT_ARG_MSTRZ, &priv->outputfilename, NULL},
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{"fast", OPT_ARG_BOOL, &fast, NULL},
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{NULL}
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};
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// set defaults
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priv->waveheader = 1;
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if (subopt_parse(params, subopts) != 0)
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return -1;
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if (fast)
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mp_msg(MSGT_AO, MSGL_WARN,
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"[AO PCM] Suboption \"fast\" is deprecated.\n"
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"[AO PCM] Use -novideo, or -benchmark if you want "
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"faster playback with video.\n");
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if (!priv->outputfilename)
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priv->outputfilename =
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strdup(priv->waveheader ? "audiodump.wav" : "audiodump.pcm");
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if (priv->waveheader) {
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// WAV files must have one of the following formats
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switch (ao->format) {
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case AF_FORMAT_U8:
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case AF_FORMAT_S16_LE:
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case AF_FORMAT_S24_LE:
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case AF_FORMAT_S32_LE:
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case AF_FORMAT_FLOAT_LE:
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case AF_FORMAT_AC3_BE:
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case AF_FORMAT_AC3_LE:
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break;
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default:
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ao->format = AF_FORMAT_S16_LE;
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break;
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}
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}
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ao->outburst = 65536;
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ao->bps = ao->channels * ao->samplerate * (af_fmt2bits(ao->format) / 8);
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mp_tmsg(MSGT_AO, MSGL_INFO, "[AO PCM] File: %s (%s)\n"
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"PCM: 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, af_fmt2str_short(ao->format));
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mp_tmsg(MSGT_AO, MSGL_INFO,
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"[AO PCM] Info: Faster dumping is achieved with -novideo\n"
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"[AO PCM] 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_tmsg(MSGT_AO, MSGL_ERR, "[AO PCM] Failed to open %s for writing!\n",
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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, bool cut_audio)
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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_msg(MSGT_AO, MSGL_ERR, "Could not seek to start, "
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"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_msg(MSGT_AO, MSGL_ERR, "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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free(priv->outputfilename);
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}
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static int get_space(struct ao *ao)
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{
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return ao->outburst;
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}
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static int play(struct ao *ao, void *data, int len, int flags)
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{
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struct priv *priv = ao->priv;
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if (ao->channels == 5 || ao->channels == 6 || ao->channels == 8) {
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int frame_size = af_fmt2bits(ao->format) / 8;
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len -= len % (frame_size * ao->channels);
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reorder_channel_nch(data, AF_CHANNEL_LAYOUT_MPLAYER_DEFAULT,
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AF_CHANNEL_LAYOUT_WAVEEX_DEFAULT,
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ao->channels, len / frame_size, frame_size);
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}
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fwrite(data, len, 1, priv->fp);
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priv->data_length += len;
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return len;
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}
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const struct ao_driver audio_out_pcm = {
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.is_new = true,
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.info = &(const struct ao_info) {
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"RAW PCM/WAVE file writer audio output",
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"pcm",
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"Atmosfear",
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"",
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},
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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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};
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