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mpv/libaf/af_lavcac3enc.c

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/*
* audio filter for runtime AC-3 encoding with libavcodec.
*
* Copyright (C) 2007 Ulion <ulion A gmail P com>
*
* This file is part of MPlayer.
*
* MPlayer 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.
*
* MPlayer 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 MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include "config.h"
#include "af.h"
#include "help_mp.h"
#include "reorder_ch.h"
#include "libavcodec/avcodec.h"
#include "libavcodec/ac3.h"
// Data for specific instances of this filter
typedef struct af_ac3enc_s {
struct AVCodec *lavc_acodec;
struct AVCodecContext *lavc_actx;
int add_iec61937_header;
int bit_rate;
char *pending_data;
int pending_len;
int expect_len;
int min_channel_num;
} af_ac3enc_t;
extern int avcodec_initialized;
// Initialization and runtime control
static int control(struct af_instance_s *af, int cmd, void *arg)
{
af_ac3enc_t *s = (af_ac3enc_t *)af->setup;
af_data_t *data = (af_data_t *)arg;
int i, bit_rate, test_output_res;
static const int default_bit_rate[AC3_MAX_CHANNELS+1] = \
{0, 96000, 192000, 256000, 384000, 448000, 448000};
switch (cmd){
case AF_CONTROL_REINIT:
if (data->format == AF_FORMAT_AC3 || data->nch < s->min_channel_num)
return AF_DETACH;
s->pending_len = 0;
s->expect_len = AC3_FRAME_SIZE * data->nch * data->bps;
if (s->add_iec61937_header)
af->mul = (double)AC3_FRAME_SIZE * 2 * 2 / s->expect_len;
else
af->mul = (double)AC3_MAX_CODED_FRAME_SIZE / s->expect_len;
mp_msg(MSGT_AFILTER, MSGL_DBG2, "af_lavcac3enc reinit: %d, %d, %f, %d.\n",
data->nch, data->rate, af->mul, s->expect_len);
af->data->format = AF_FORMAT_S16_NE;
if (data->rate == 48000 || data->rate == 44100 || data->rate == 32000)
af->data->rate = data->rate;
else
af->data->rate = 48000;
if (data->nch > AC3_MAX_CHANNELS)
af->data->nch = AC3_MAX_CHANNELS;
else
af->data->nch = data->nch;
af->data->bps = 2;
test_output_res = af_test_output(af, data);
bit_rate = s->bit_rate ? s->bit_rate : default_bit_rate[af->data->nch];
if (s->lavc_actx->channels != af->data->nch ||
s->lavc_actx->sample_rate != af->data->rate ||
s->lavc_actx->bit_rate != bit_rate) {
if (s->lavc_actx->codec)
avcodec_close(s->lavc_actx);
// Put sample parameters
s->lavc_actx->channels = af->data->nch;
s->lavc_actx->sample_rate = af->data->rate;
s->lavc_actx->bit_rate = bit_rate;
if(avcodec_open(s->lavc_actx, s->lavc_acodec) < 0) {
mp_msg(MSGT_AFILTER, MSGL_ERR, MSGTR_CouldntOpenCodec, "ac3", bit_rate);
return AF_ERROR;
}
}
af->data->format = AF_FORMAT_AC3;
af->data->nch = 2;
return test_output_res;
case AF_CONTROL_COMMAND_LINE:
mp_msg(MSGT_AFILTER, MSGL_DBG2, "af_lavcac3enc cmdline: %s.\n", (char*)arg);
s->bit_rate = 0;
s->min_channel_num = 0;
s->add_iec61937_header = 0;
sscanf((char*)arg,"%d:%d:%d", &s->add_iec61937_header, &s->bit_rate,
&s->min_channel_num);
if (s->bit_rate < 1000)
s->bit_rate *= 1000;
if (s->bit_rate) {
for (i = 0; i < 19; ++i)
if (ff_ac3_bitrate_tab[i] * 1000 == s->bit_rate)
break;
if (i >= 19) {
mp_msg(MSGT_AFILTER, MSGL_WARN, "af_lavcac3enc unable set unsupported "
"bitrate %d, use default bitrate (check manpage to see "
"supported bitrates).\n", s->bit_rate);
s->bit_rate = 0;
}
}
if (s->min_channel_num == 0)
s->min_channel_num = 5;
mp_msg(MSGT_AFILTER, MSGL_V, "af_lavcac3enc config spdif:%d, bitrate:%d, "
"minchnum:%d.\n", s->add_iec61937_header, s->bit_rate,
s->min_channel_num);
return AF_OK;
}
return AF_UNKNOWN;
}
// Deallocate memory
static void uninit(struct af_instance_s* af)
{
if (af->data)
free(af->data->audio);
free(af->data);
if (af->setup) {
af_ac3enc_t *s = af->setup;
af->setup = NULL;
if(s->lavc_actx) {
if (s->lavc_actx->codec)
avcodec_close(s->lavc_actx);
free(s->lavc_actx);
}
free(s->pending_data);
free(s);
}
}
// Filter data through filter
static af_data_t* play(struct af_instance_s* af, af_data_t* data)
{
af_ac3enc_t *s = af->setup;
af_data_t *c = data; // Current working data
af_data_t *l;
int len, left, outsize = 0, destsize;
char *buf, *src, *dest;
int max_output_len;
int frame_num = (data->len + s->pending_len) / s->expect_len;
if (s->add_iec61937_header)
max_output_len = AC3_FRAME_SIZE * 2 * 2 * frame_num;
else
max_output_len = AC3_MAX_CODED_FRAME_SIZE * frame_num;
if (af->data->len < max_output_len) {
mp_msg(MSGT_AFILTER, MSGL_V, "[libaf] Reallocating memory in module %s, "
"old len = %i, new len = %i\n", af->info->name, af->data->len,
max_output_len);
free(af->data->audio);
af->data->audio = malloc(max_output_len);
if (!af->data->audio) {
mp_msg(MSGT_AFILTER, MSGL_FATAL, "[libaf] Could not allocate memory \n");
return NULL;
}
af->data->len = max_output_len;
}
l = af->data; // Local data
buf = (char *)l->audio;
src = (char *)c->audio;
left = c->len;
while (left > 0) {
if (left + s->pending_len < s->expect_len) {
memcpy(s->pending_data + s->pending_len, src, left);
src += left;
s->pending_len += left;
left = 0;
break;
}
dest = s->add_iec61937_header ? buf + 8 : buf;
destsize = (char *)l->audio + l->len - buf;
if (s->pending_len) {
int needs = s->expect_len - s->pending_len;
if (needs > 0) {
memcpy(s->pending_data + s->pending_len, src, needs);
src += needs;
left -= needs;
}
if (c->nch >= 5)
reorder_channel_nch(s->pending_data,
AF_CHANNEL_LAYOUT_MPLAYER_DEFAULT,
AF_CHANNEL_LAYOUT_LAVC_AC3_DEFAULT,
c->nch,
s->expect_len / 2, 2);
len = avcodec_encode_audio(s->lavc_actx, dest, destsize,
(void *)s->pending_data);
s->pending_len = 0;
}
else {
if (c->nch >= 5)
reorder_channel_nch(src,
AF_CHANNEL_LAYOUT_MPLAYER_DEFAULT,
AF_CHANNEL_LAYOUT_LAVC_AC3_DEFAULT,
c->nch,
s->expect_len / 2, 2);
len = avcodec_encode_audio(s->lavc_actx,dest,destsize,(void *)src);
src += s->expect_len;
left -= s->expect_len;
}
mp_msg(MSGT_AFILTER, MSGL_DBG2, "avcodec_encode_audio got %d, pending %d.\n",
len, s->pending_len);
if (s->add_iec61937_header) {
int16_t *out = (int16_t *)buf;
int bsmod = dest[5] & 0x7;
#if !HAVE_BIGENDIAN
int i;
char tmp;
for (i = 0; i < len; i += 2) {
tmp = dest[i];
dest[i] = dest[i+1];
dest[i+1] = tmp;
}
if (len & 1) {
dest[len] = dest[len-1];
dest[len-1] = 0;
len++;
}
#endif
out[0] = 0xF872; // iec 61937 syncword 1
out[1] = 0x4E1F; // iec 61937 syncword 2
out[2] = 0x0001; // data-type ac3
out[2] |= bsmod << 8; // bsmod
out[3] = len << 3; // number of bits in payload
memset(buf + 8 + len, 0, AC3_FRAME_SIZE * 2 * 2 - 8 - len);
len = AC3_FRAME_SIZE * 2 * 2;
}
outsize += len;
buf += len;
}
c->audio = l->audio;
c->nch = 2;
c->bps = 2;
c->len = outsize;
mp_msg(MSGT_AFILTER, MSGL_DBG2, "play return size %d, pending %d\n",
outsize, s->pending_len);
return c;
}
static int af_open(af_instance_t* af){
af_ac3enc_t *s = calloc(1,sizeof(af_ac3enc_t));
int pending_space = 2 * AC3_MAX_CHANNELS * AC3_FRAME_SIZE;
s->pending_data = calloc(pending_space, sizeof(char));
af->control=control;
af->uninit=uninit;
af->play=play;
af->mul=1;
af->data=calloc(1,sizeof(af_data_t));
af->setup=s;
if (!avcodec_initialized){
avcodec_init();
avcodec_register_all();
avcodec_initialized=1;
}
s->lavc_acodec = avcodec_find_encoder_by_name("ac3");
if (!s->lavc_acodec) {
mp_msg(MSGT_AFILTER, MSGL_ERR, MSGTR_LavcAudioCodecNotFound, "ac3");
return AF_ERROR;
}
s->lavc_actx = avcodec_alloc_context();
if (!s->lavc_actx) {
mp_msg(MSGT_AFILTER, MSGL_ERR, MSGTR_CouldntAllocateLavcContext);
return AF_ERROR;
}
return AF_OK;
}
af_info_t af_info_lavcac3enc = {
"runtime encode to ac3 using libavcodec",
"lavcac3enc",
"Ulion",
"",
AF_FLAGS_REENTRANT,
af_open
};
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