ffmpeg/libavcodec/ftr.c

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/*
* 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 "adts_header.h"
#include "avcodec.h"
#include "codec_internal.h"
#include "get_bits.h"
#include "decode.h"
typedef struct FTRContext {
AVCodecContext *aac_avctx[64]; // wrapper context for AAC
int nb_context;
AVPacket *packet;
AVFrame *frame;
} FTRContext;
static av_cold int ftr_init(AVCodecContext *avctx)
{
FTRContext *s = avctx->priv_data;
const AVCodec *codec;
int ret;
if (avctx->ch_layout.nb_channels > 64 ||
avctx->ch_layout.nb_channels <= 0)
return AVERROR(ENOTSUP);
s->packet = av_packet_alloc();
if (!s->packet)
return AVERROR(ENOMEM);
s->frame = av_frame_alloc();
if (!s->frame)
return AVERROR(ENOMEM);
s->nb_context = avctx->ch_layout.nb_channels;
codec = avcodec_find_decoder(AV_CODEC_ID_AAC);
if (!codec)
return AVERROR_BUG;
for (int i = 0; i < s->nb_context; i++) {
s->aac_avctx[i] = avcodec_alloc_context3(codec);
if (!s->aac_avctx[i])
return AVERROR(ENOMEM);
ret = avcodec_open2(s->aac_avctx[i], codec, NULL);
if (ret < 0)
return ret;
}
avctx->sample_fmt = s->aac_avctx[0]->sample_fmt;
if (!av_sample_fmt_is_planar(avctx->sample_fmt))
return AVERROR(EINVAL);
return 0;
}
static int ftr_decode_frame(AVCodecContext *avctx, AVFrame *frame,
int *got_frame, AVPacket *avpkt)
{
FTRContext *s = avctx->priv_data;
GetBitContext gb;
int ret, ch_offset = 0;
ret = init_get_bits8(&gb, avpkt->data, avpkt->size);
if (ret < 0)
return ret;
frame->nb_samples = 0;
for (int i = 0; i < s->nb_context; i++) {
AVCodecContext *codec_avctx = s->aac_avctx[i];
GetBitContext gb2 = gb;
AACADTSHeaderInfo hdr_info;
int size;
if (get_bits_left(&gb) < 64)
return AVERROR_INVALIDDATA;
memset(&hdr_info, 0, sizeof(hdr_info));
size = ff_adts_header_parse(&gb2, &hdr_info);
if (size <= 0 || size * 8 > get_bits_left(&gb))
return AVERROR_INVALIDDATA;
if (size > s->packet->size) {
ret = av_grow_packet(s->packet, size - s->packet->size);
if (ret < 0)
return ret;
}
ret = av_packet_make_writable(s->packet);
if (ret < 0)
return ret;
memcpy(s->packet->data, avpkt->data + (get_bits_count(&gb) >> 3), size);
s->packet->size = size;
if (size > 12) {
uint8_t *buf = s->packet->data;
if (buf[3] & 0x20) {
int tmp = buf[8];
buf[ 9] = ~buf[9];
buf[11] = ~buf[11];
buf[12] = ~buf[12];
buf[ 8] = ~buf[10];
buf[10] = ~tmp;
}
}
ret = avcodec_send_packet(codec_avctx, s->packet);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Error submitting a packet for decoding\n");
return ret;
}
ret = avcodec_receive_frame(codec_avctx, s->frame);
if (ret < 0)
return ret;
if (!avctx->sample_rate) {
avctx->sample_rate = codec_avctx->sample_rate;
} else {
if (avctx->sample_rate != codec_avctx->sample_rate)
return AVERROR_INVALIDDATA;
}
if (!frame->nb_samples) {
frame->nb_samples = s->frame->nb_samples;
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;
} else {
if (frame->nb_samples != s->frame->nb_samples)
return AVERROR_INVALIDDATA;
}
skip_bits_long(&gb, size * 8);
if (ch_offset + s->frame->ch_layout.nb_channels > avctx->ch_layout.nb_channels)
return AVERROR_INVALIDDATA;
if (avctx->sample_fmt != codec_avctx->sample_fmt)
return AVERROR_INVALIDDATA;
for (int ch = 0; ch < s->frame->ch_layout.nb_channels; ch++)
memcpy(frame->extended_data[ch_offset + ch],
s->frame->extended_data[ch],
av_get_bytes_per_sample(codec_avctx->sample_fmt) * s->frame->nb_samples);
ch_offset += s->frame->ch_layout.nb_channels;
if (ch_offset >= avctx->ch_layout.nb_channels)
break;
}
*got_frame = 1;
return get_bits_count(&gb) >> 3;
}
static void ftr_flush(AVCodecContext *avctx)
{
FTRContext *s = avctx->priv_data;
for (int i = 0; i < s->nb_context; i++)
avcodec_flush_buffers(s->aac_avctx[i]);
}
static av_cold int ftr_close(AVCodecContext *avctx)
{
FTRContext *s = avctx->priv_data;
for (int i = 0; i < s->nb_context; i++)
avcodec_free_context(&s->aac_avctx[i]);
av_packet_free(&s->packet);
av_frame_free(&s->frame);
return 0;
}
const FFCodec ff_ftr_decoder = {
.p.name = "ftr",
.p.long_name = NULL_IF_CONFIG_SMALL("FTR Voice"),
.p.type = AVMEDIA_TYPE_AUDIO,
.p.id = AV_CODEC_ID_FTR,
.init = ftr_init,
FF_CODEC_DECODE_CB(ftr_decode_frame),
.close = ftr_close,
.flush = ftr_flush,
.priv_data_size = sizeof(FTRContext),
.p.capabilities = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
};