mirror of
https://github.com/mpv-player/mpv
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c5812d6056
The only FFmpeg internal symbols required were some constants. Define them in the file itself instead. Also add some checks and fixes to make the code more robust and fix a potential memory corruption problem.
319 lines
10 KiB
C
319 lines
10 KiB
C
/*
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* audio filter for runtime AC-3 encoding with libavcodec.
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*
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* Copyright (C) 2007 Ulion <ulion A gmail P com>
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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 <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <inttypes.h>
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#include <assert.h>
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#include "config.h"
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#include "af.h"
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#include "reorder_ch.h"
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#include "libavcodec/avcodec.h"
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#include "ffmpeg_files/intreadwrite.h"
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#define AC3_MAX_CHANNELS 6
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#define AC3_MAX_CODED_FRAME_SIZE 3840
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#define AC3_FRAME_SIZE (6 * 256)
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const uint16_t ac3_bitrate_tab[19] = {
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32, 40, 48, 56, 64, 80, 96, 112, 128,
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160, 192, 224, 256, 320, 384, 448, 512, 576, 640
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};
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// Data for specific instances of this filter
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typedef struct af_ac3enc_s {
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struct AVCodec *lavc_acodec;
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struct AVCodecContext *lavc_actx;
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int add_iec61937_header;
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int bit_rate;
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int pending_data_size;
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char *pending_data;
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int pending_len;
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int expect_len;
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int min_channel_num;
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} af_ac3enc_t;
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extern int avcodec_initialized;
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// Initialization and runtime control
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static int control(struct af_instance_s *af, int cmd, void *arg)
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{
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af_ac3enc_t *s = (af_ac3enc_t *)af->setup;
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af_data_t *data = (af_data_t *)arg;
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int i, bit_rate, test_output_res;
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static const int default_bit_rate[AC3_MAX_CHANNELS+1] = \
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{0, 96000, 192000, 256000, 384000, 448000, 448000};
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switch (cmd){
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case AF_CONTROL_REINIT:
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if (AF_FORMAT_IS_AC3(data->format) || data->nch < s->min_channel_num)
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return AF_DETACH;
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s->pending_len = 0;
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s->expect_len = AC3_FRAME_SIZE * data->nch * data->bps;
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assert(s->expect_len <= s->pending_data_size);
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if (s->add_iec61937_header)
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af->mul = (double)AC3_FRAME_SIZE * 2 * 2 / s->expect_len;
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else
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af->mul = (double)AC3_MAX_CODED_FRAME_SIZE / s->expect_len;
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mp_msg(MSGT_AFILTER, MSGL_DBG2, "af_lavcac3enc reinit: %d, %d, %f, %d.\n",
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data->nch, data->rate, af->mul, s->expect_len);
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af->data->format = AF_FORMAT_S16_NE;
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if (data->rate == 48000 || data->rate == 44100 || data->rate == 32000)
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af->data->rate = data->rate;
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else
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af->data->rate = 48000;
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if (data->nch > AC3_MAX_CHANNELS)
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af->data->nch = AC3_MAX_CHANNELS;
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else
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af->data->nch = data->nch;
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af->data->bps = 2;
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test_output_res = af_test_output(af, data);
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bit_rate = s->bit_rate ? s->bit_rate : default_bit_rate[af->data->nch];
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if (s->lavc_actx->channels != af->data->nch ||
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s->lavc_actx->sample_rate != af->data->rate ||
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s->lavc_actx->bit_rate != bit_rate) {
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if (s->lavc_actx->codec)
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avcodec_close(s->lavc_actx);
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// Put sample parameters
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s->lavc_actx->channels = af->data->nch;
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s->lavc_actx->sample_rate = af->data->rate;
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s->lavc_actx->bit_rate = bit_rate;
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if(avcodec_open(s->lavc_actx, s->lavc_acodec) < 0) {
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mp_tmsg(MSGT_AFILTER, MSGL_ERR, "Couldn't open codec %s, br=%d.\n", "ac3", bit_rate);
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return AF_ERROR;
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}
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}
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if (s->lavc_actx->frame_size != AC3_FRAME_SIZE) {
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mp_msg(MSGT_AFILTER, MSGL_ERR, "lavcac3enc: unexpected ac3 "
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"encoder frame size %d\n", s->lavc_actx->frame_size);
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return AF_ERROR;
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}
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af->data->format = AF_FORMAT_AC3_BE;
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af->data->nch = 2;
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return test_output_res;
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case AF_CONTROL_COMMAND_LINE:
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mp_msg(MSGT_AFILTER, MSGL_DBG2, "af_lavcac3enc cmdline: %s.\n", (char*)arg);
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s->bit_rate = 0;
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s->min_channel_num = 0;
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s->add_iec61937_header = 0;
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sscanf((char*)arg,"%d:%d:%d", &s->add_iec61937_header, &s->bit_rate,
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&s->min_channel_num);
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if (s->bit_rate < 1000)
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s->bit_rate *= 1000;
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if (s->bit_rate) {
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for (i = 0; i < 19; ++i)
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if (ac3_bitrate_tab[i] * 1000 == s->bit_rate)
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break;
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if (i >= 19) {
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mp_msg(MSGT_AFILTER, MSGL_WARN, "af_lavcac3enc unable set unsupported "
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"bitrate %d, use default bitrate (check manpage to see "
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"supported bitrates).\n", s->bit_rate);
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s->bit_rate = 0;
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}
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}
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if (s->min_channel_num == 0)
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s->min_channel_num = 5;
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mp_msg(MSGT_AFILTER, MSGL_V, "af_lavcac3enc config spdif:%d, bitrate:%d, "
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"minchnum:%d.\n", s->add_iec61937_header, s->bit_rate,
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s->min_channel_num);
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return AF_OK;
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}
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return AF_UNKNOWN;
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}
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// Deallocate memory
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static void uninit(struct af_instance_s* af)
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{
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if (af->data)
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free(af->data->audio);
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free(af->data);
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if (af->setup) {
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af_ac3enc_t *s = af->setup;
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af->setup = NULL;
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if(s->lavc_actx) {
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if (s->lavc_actx->codec)
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avcodec_close(s->lavc_actx);
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free(s->lavc_actx);
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}
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free(s->pending_data);
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free(s);
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}
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}
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// Filter data through filter
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static af_data_t* play(struct af_instance_s* af, af_data_t* data)
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{
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af_ac3enc_t *s = af->setup;
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af_data_t *c = data; // Current working data
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af_data_t *l;
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int len, left, outsize = 0, destsize;
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char *buf, *src, *dest;
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int max_output_len;
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int frame_num = (data->len + s->pending_len) / s->expect_len;
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if (s->add_iec61937_header)
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max_output_len = AC3_FRAME_SIZE * 2 * 2 * frame_num;
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else
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max_output_len = AC3_MAX_CODED_FRAME_SIZE * frame_num;
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if (af->data->len < max_output_len) {
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mp_msg(MSGT_AFILTER, MSGL_V, "[libaf] Reallocating memory in module %s, "
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"old len = %i, new len = %i\n", af->info->name, af->data->len,
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max_output_len);
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free(af->data->audio);
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af->data->audio = malloc(max_output_len);
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if (!af->data->audio) {
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mp_msg(MSGT_AFILTER, MSGL_FATAL, "[libaf] Could not allocate memory \n");
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return NULL;
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}
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af->data->len = max_output_len;
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}
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l = af->data; // Local data
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buf = (char *)l->audio;
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src = (char *)c->audio;
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left = c->len;
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while (left > 0) {
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if (left + s->pending_len < s->expect_len) {
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memcpy(s->pending_data + s->pending_len, src, left);
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src += left;
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s->pending_len += left;
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left = 0;
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break;
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}
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dest = s->add_iec61937_header ? buf + 8 : buf;
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destsize = (char *)l->audio + l->len - buf;
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if (s->pending_len) {
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int needs = s->expect_len - s->pending_len;
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if (needs > 0) {
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memcpy(s->pending_data + s->pending_len, src, needs);
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src += needs;
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left -= needs;
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}
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if (c->nch >= 5)
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reorder_channel_nch(s->pending_data,
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AF_CHANNEL_LAYOUT_MPLAYER_DEFAULT,
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AF_CHANNEL_LAYOUT_LAVC_DEFAULT,
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c->nch,
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s->expect_len / 2, 2);
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len = avcodec_encode_audio(s->lavc_actx, dest, destsize,
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(void *)s->pending_data);
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s->pending_len = 0;
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}
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else {
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if (c->nch >= 5)
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reorder_channel_nch(src,
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AF_CHANNEL_LAYOUT_MPLAYER_DEFAULT,
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AF_CHANNEL_LAYOUT_LAVC_DEFAULT,
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c->nch,
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s->expect_len / 2, 2);
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len = avcodec_encode_audio(s->lavc_actx,dest,destsize,(void *)src);
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src += s->expect_len;
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left -= s->expect_len;
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}
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mp_msg(MSGT_AFILTER, MSGL_DBG2, "avcodec_encode_audio got %d, pending %d.\n",
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len, s->pending_len);
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if (s->add_iec61937_header) {
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int bsmod = dest[5] & 0x7;
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AV_WB16(buf, 0xF872); // iec 61937 syncword 1
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AV_WB16(buf + 2, 0x4E1F); // iec 61937 syncword 2
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buf[4] = bsmod; // bsmod
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buf[5] = 0x01; // data-type ac3
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AV_WB16(buf + 6, len << 3); // number of bits in payload
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memset(buf + 8 + len, 0, AC3_FRAME_SIZE * 2 * 2 - 8 - len);
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len = AC3_FRAME_SIZE * 2 * 2;
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}
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outsize += len;
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buf += len;
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}
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c->audio = l->audio;
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c->nch = 2;
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c->bps = 2;
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c->len = outsize;
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mp_msg(MSGT_AFILTER, MSGL_DBG2, "play return size %d, pending %d\n",
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outsize, s->pending_len);
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return c;
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}
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static int af_open(af_instance_t* af){
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af_ac3enc_t *s = calloc(1,sizeof(af_ac3enc_t));
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s->pending_data_size = 2 * AF_NCH * AC3_FRAME_SIZE;
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s->pending_data = malloc(s->pending_data_size);
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af->control=control;
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af->uninit=uninit;
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af->play=play;
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af->mul=1;
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af->data=calloc(1,sizeof(af_data_t));
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af->setup=s;
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if (!avcodec_initialized){
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avcodec_init();
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avcodec_register_all();
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avcodec_initialized=1;
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}
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s->lavc_acodec = avcodec_find_encoder_by_name("ac3");
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if (!s->lavc_acodec) {
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mp_tmsg(MSGT_AFILTER, MSGL_ERR, "Audio LAVC, couldn't find encoder for codec %s.\n", "ac3");
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return AF_ERROR;
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}
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s->lavc_actx = avcodec_alloc_context();
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if (!s->lavc_actx) {
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mp_tmsg(MSGT_AFILTER, MSGL_ERR, "Audio LAVC, couldn't allocate context!\n");
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return AF_ERROR;
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}
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return AF_OK;
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}
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af_info_t af_info_lavcac3enc = {
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"runtime encode to ac3 using libavcodec",
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"lavcac3enc",
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"Ulion",
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"",
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AF_FLAGS_REENTRANT,
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af_open
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};
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