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FFmpeg/libavcodec/libvorbisdec.c
Andreas Rheinhardt 20f9727018 avcodec/codec_internal: Add FFCodec, hide internal part of AVCodec
Up until now, codec.h contains both public and private parts
of AVCodec. This exposes the internals of AVCodec to users
and leads them into the temptation of actually using them
and forces us to forward-declare structures and types that
users can't use at all.

This commit changes this by adding a new structure FFCodec to
codec_internal.h that extends AVCodec, i.e. contains the public
AVCodec as first member; the private fields of AVCodec are moved
to this structure, leaving codec.h clean.

Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-03-21 01:33:09 +01:00

225 lines
7.2 KiB
C

/*
* Copyright (c) 2002 Mark Hills <mark@pogo.org.uk>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <vorbis/vorbisenc.h>
#include "avcodec.h"
#include "bytestream.h"
#include "codec_internal.h"
#include "internal.h"
typedef struct OggVorbisDecContext {
vorbis_info vi; /**< vorbis_info used during init */
vorbis_dsp_state vd; /**< DSP state used for analysis */
vorbis_block vb; /**< vorbis_block used for analysis */
vorbis_comment vc; /**< VorbisComment info */
ogg_packet op; /**< ogg packet */
} OggVorbisDecContext;
static int oggvorbis_decode_close(AVCodecContext *avccontext);
static int oggvorbis_decode_init(AVCodecContext *avccontext) {
OggVorbisDecContext *context = avccontext->priv_data ;
uint8_t *p= avccontext->extradata;
int i, hsizes[3], ret;
unsigned char *headers[3], *extradata = avccontext->extradata;
if(! avccontext->extradata_size || ! p) {
av_log(avccontext, AV_LOG_ERROR, "vorbis extradata absent\n");
return AVERROR(EINVAL);
}
vorbis_info_init(&context->vi) ;
vorbis_comment_init(&context->vc) ;
if(p[0] == 0 && p[1] == 30) {
int sizesum = 0;
for(i = 0; i < 3; i++){
hsizes[i] = bytestream_get_be16((const uint8_t **)&p);
sizesum += 2 + hsizes[i];
if (sizesum > avccontext->extradata_size) {
av_log(avccontext, AV_LOG_ERROR, "vorbis extradata too small\n");
ret = AVERROR_INVALIDDATA;
goto error;
}
headers[i] = p;
p += hsizes[i];
}
} else if(*p == 2) {
unsigned int offset = 1;
unsigned int sizesum = 1;
p++;
for(i=0; i<2; i++) {
hsizes[i] = 0;
while((*p == 0xFF) && (sizesum < avccontext->extradata_size)) {
hsizes[i] += 0xFF;
offset++;
sizesum += 1 + 0xFF;
p++;
}
hsizes[i] += *p;
offset++;
sizesum += 1 + *p;
if(sizesum > avccontext->extradata_size) {
av_log(avccontext, AV_LOG_ERROR,
"vorbis header sizes damaged\n");
ret = AVERROR_INVALIDDATA;
goto error;
}
p++;
}
hsizes[2] = avccontext->extradata_size - hsizes[0]-hsizes[1]-offset;
#if 0
av_log(avccontext, AV_LOG_DEBUG,
"vorbis header sizes: %d, %d, %d, / extradata_len is %d \n",
hsizes[0], hsizes[1], hsizes[2], avccontext->extradata_size);
#endif
headers[0] = extradata + offset;
headers[1] = extradata + offset + hsizes[0];
headers[2] = extradata + offset + hsizes[0] + hsizes[1];
} else {
av_log(avccontext, AV_LOG_ERROR,
"vorbis initial header len is wrong: %d\n", *p);
ret = AVERROR_INVALIDDATA;
goto error;
}
for(i=0; i<3; i++){
context->op.b_o_s= i==0;
context->op.bytes = hsizes[i];
context->op.packet = headers[i];
if(vorbis_synthesis_headerin(&context->vi, &context->vc, &context->op)<0){
av_log(avccontext, AV_LOG_ERROR, "%d. vorbis header damaged\n", i+1);
ret = AVERROR_INVALIDDATA;
goto error;
}
}
av_channel_layout_uninit(&avccontext->ch_layout);
avccontext->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
avccontext->ch_layout.nb_channels = context->vi.channels;
avccontext->sample_rate = context->vi.rate;
avccontext->sample_fmt = AV_SAMPLE_FMT_S16;
avccontext->time_base= (AVRational){1, avccontext->sample_rate};
vorbis_synthesis_init(&context->vd, &context->vi);
vorbis_block_init(&context->vd, &context->vb);
return 0 ;
error:
oggvorbis_decode_close(avccontext);
return ret;
}
static inline int conv(int samples, float **pcm, char *buf, int channels) {
int i, j;
ogg_int16_t *ptr, *data = (ogg_int16_t*)buf ;
float *mono ;
for(i = 0 ; i < channels ; i++){
ptr = &data[i];
mono = pcm[i] ;
for(j = 0 ; j < samples ; j++) {
*ptr = av_clip_int16(mono[j] * 32767.f);
ptr += channels;
}
}
return 0 ;
}
static int oggvorbis_decode_frame(AVCodecContext *avccontext, void *data,
int *got_frame_ptr, AVPacket *avpkt)
{
OggVorbisDecContext *context = avccontext->priv_data ;
AVFrame *frame = data;
float **pcm ;
ogg_packet *op= &context->op;
int samples, total_samples, total_bytes;
int ret;
int16_t *output;
if(!avpkt->size){
//FIXME flush
return 0;
}
frame->nb_samples = 8192*4;
if ((ret = ff_get_buffer(avccontext, frame, 0)) < 0)
return ret;
output = (int16_t *)frame->data[0];
op->packet = avpkt->data;
op->bytes = avpkt->size;
// av_log(avccontext, AV_LOG_DEBUG, "%d %d %d %"PRId64" %"PRId64" %d %d\n", op->bytes, op->b_o_s, op->e_o_s, op->granulepos, op->packetno, buf_size, context->vi.rate);
/* for(i=0; i<op->bytes; i++)
av_log(avccontext, AV_LOG_DEBUG, "%02X ", op->packet[i]);
av_log(avccontext, AV_LOG_DEBUG, "\n");*/
if(vorbis_synthesis(&context->vb, op) == 0)
vorbis_synthesis_blockin(&context->vd, &context->vb) ;
total_samples = 0 ;
total_bytes = 0 ;
while((samples = vorbis_synthesis_pcmout(&context->vd, &pcm)) > 0) {
conv(samples, pcm, (char*)output + total_bytes, context->vi.channels) ;
total_bytes += samples * 2 * context->vi.channels ;
total_samples += samples ;
vorbis_synthesis_read(&context->vd, samples) ;
}
frame->nb_samples = total_samples;
*got_frame_ptr = total_samples > 0;
return avpkt->size;
}
static int oggvorbis_decode_close(AVCodecContext *avccontext) {
OggVorbisDecContext *context = avccontext->priv_data ;
vorbis_block_clear(&context->vb);
vorbis_dsp_clear(&context->vd);
vorbis_info_clear(&context->vi) ;
vorbis_comment_clear(&context->vc) ;
return 0 ;
}
const FFCodec ff_libvorbis_decoder = {
.p.name = "libvorbis",
.p.long_name = NULL_IF_CONFIG_SMALL("libvorbis"),
.p.type = AVMEDIA_TYPE_AUDIO,
.p.id = AV_CODEC_ID_VORBIS,
.p.capabilities = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_CHANNEL_CONF,
.priv_data_size = sizeof(OggVorbisDecContext),
.init = oggvorbis_decode_init,
.decode = oggvorbis_decode_frame,
.close = oggvorbis_decode_close,
};