204 lines
6.8 KiB
C
Executable file
204 lines
6.8 KiB
C
Executable file
/*
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* Copyright (C) 2008 David Conrad
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <speex/speex.h>
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#include <speex/speex_header.h>
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#include <speex/speex_stereo.h>
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#include <speex/speex_callbacks.h>
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#include "libavutil/channel_layout.h"
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#include "libavutil/common.h"
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#include "avcodec.h"
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#include "internal.h"
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typedef struct LibSpeexContext {
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SpeexBits bits;
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SpeexStereoState stereo;
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void *dec_state;
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int frame_size;
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int pktsize;
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} LibSpeexContext;
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static av_cold int libspeex_decode_init(AVCodecContext *avctx)
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{
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LibSpeexContext *s = avctx->priv_data;
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const SpeexMode *mode;
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SpeexHeader *header = NULL;
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int spx_mode;
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if (avctx->extradata && avctx->extradata_size >= 80) {
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header = speex_packet_to_header(avctx->extradata,
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avctx->extradata_size);
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if (!header)
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av_log(avctx, AV_LOG_WARNING, "Invalid Speex header\n");
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}
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if (avctx->codec_tag == MKTAG('S', 'P', 'X', 'N')) {
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int quality;
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if (!avctx->extradata || avctx->extradata && avctx->extradata_size < 47) {
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av_log(avctx, AV_LOG_ERROR, "Missing or invalid extradata.\n");
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return AVERROR_INVALIDDATA;
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}
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quality = avctx->extradata[37];
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if (quality > 10) {
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av_log(avctx, AV_LOG_ERROR, "Unsupported quality mode %d.\n", quality);
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return AVERROR_PATCHWELCOME;
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}
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s->pktsize = ((const int[]){5,10,15,20,20,28,28,38,38,46,62})[quality];
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spx_mode = 0;
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} else if (header) {
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avctx->sample_rate = header->rate;
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avctx->channels = header->nb_channels;
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spx_mode = header->mode;
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speex_header_free(header);
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} else {
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switch (avctx->sample_rate) {
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case 8000: spx_mode = 0; break;
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case 16000: spx_mode = 1; break;
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case 32000: spx_mode = 2; break;
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default:
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/* libspeex can handle any mode if initialized as ultra-wideband */
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av_log(avctx, AV_LOG_WARNING, "Invalid sample rate: %d\n"
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"Decoding as 32kHz ultra-wideband\n",
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avctx->sample_rate);
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spx_mode = 2;
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}
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}
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mode = speex_lib_get_mode(spx_mode);
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if (!mode) {
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av_log(avctx, AV_LOG_ERROR, "Unknown Speex mode %d", spx_mode);
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return AVERROR_INVALIDDATA;
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}
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s->frame_size = 160 << spx_mode;
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if (!avctx->sample_rate)
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avctx->sample_rate = 8000 << spx_mode;
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if (avctx->channels < 1 || avctx->channels > 2) {
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/* libspeex can handle mono or stereo if initialized as stereo */
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av_log(avctx, AV_LOG_ERROR, "Invalid channel count: %d.\n"
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"Decoding as stereo.\n", avctx->channels);
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avctx->channels = 2;
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}
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avctx->channel_layout = avctx->channels == 2 ? AV_CH_LAYOUT_STEREO :
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AV_CH_LAYOUT_MONO;
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speex_bits_init(&s->bits);
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s->dec_state = speex_decoder_init(mode);
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if (!s->dec_state) {
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av_log(avctx, AV_LOG_ERROR, "Error initializing libspeex decoder.\n");
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return -1;
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}
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if (avctx->channels == 2) {
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SpeexCallback callback;
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callback.callback_id = SPEEX_INBAND_STEREO;
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callback.func = speex_std_stereo_request_handler;
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callback.data = &s->stereo;
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s->stereo = (SpeexStereoState)SPEEX_STEREO_STATE_INIT;
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speex_decoder_ctl(s->dec_state, SPEEX_SET_HANDLER, &callback);
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}
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return 0;
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}
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static int libspeex_decode_frame(AVCodecContext *avctx, void *data,
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int *got_frame_ptr, AVPacket *avpkt)
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{
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uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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LibSpeexContext *s = avctx->priv_data;
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AVFrame *frame = data;
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int16_t *output;
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int ret, consumed = 0;
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avctx->sample_fmt = AV_SAMPLE_FMT_S16;
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/* get output buffer */
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frame->nb_samples = s->frame_size;
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if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
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return ret;
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output = (int16_t *)frame->data[0];
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/* if there is not enough data left for the smallest possible frame or the
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next 5 bits are a terminator code, reset the libspeex buffer using the
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current packet, otherwise ignore the current packet and keep decoding
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frames from the libspeex buffer. */
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if (speex_bits_remaining(&s->bits) < 5 ||
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speex_bits_peek_unsigned(&s->bits, 5) == 0xF) {
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/* check for flush packet */
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if (!buf || !buf_size) {
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*got_frame_ptr = 0;
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return buf_size;
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}
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if (s->pktsize && buf_size == 62)
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buf_size = s->pktsize;
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/* set new buffer */
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speex_bits_read_from(&s->bits, buf, buf_size);
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consumed = avpkt->size;
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}
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/* decode a single frame */
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ret = speex_decode_int(s->dec_state, &s->bits, output);
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if (ret <= -2) {
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av_log(avctx, AV_LOG_ERROR, "Error decoding Speex frame.\n");
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return AVERROR_INVALIDDATA;
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}
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if (avctx->channels == 2)
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speex_decode_stereo_int(output, s->frame_size, &s->stereo);
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*got_frame_ptr = 1;
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if (!avctx->bit_rate)
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speex_decoder_ctl(s->dec_state, SPEEX_GET_BITRATE, &avctx->bit_rate);
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return consumed;
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}
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static av_cold int libspeex_decode_close(AVCodecContext *avctx)
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{
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LibSpeexContext *s = avctx->priv_data;
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speex_bits_destroy(&s->bits);
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speex_decoder_destroy(s->dec_state);
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return 0;
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}
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static av_cold void libspeex_decode_flush(AVCodecContext *avctx)
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{
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LibSpeexContext *s = avctx->priv_data;
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speex_bits_reset(&s->bits);
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}
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AVCodec ff_libspeex_decoder = {
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.name = "libspeex",
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.long_name = NULL_IF_CONFIG_SMALL("libspeex Speex"),
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.type = AVMEDIA_TYPE_AUDIO,
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.id = AV_CODEC_ID_SPEEX,
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.priv_data_size = sizeof(LibSpeexContext),
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.init = libspeex_decode_init,
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.close = libspeex_decode_close,
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.decode = libspeex_decode_frame,
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.flush = libspeex_decode_flush,
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.capabilities = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DELAY | AV_CODEC_CAP_DR1,
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.wrapper_name = "libspeex",
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};
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