/* * Copyright (C) 2008 David Conrad * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include <speex/speex.h> #include <speex/speex_header.h> #include <speex/speex_stereo.h> #include <speex/speex_callbacks.h> #include "libavutil/channel_layout.h" #include "libavutil/common.h" #include "avcodec.h" #include "internal.h" typedef struct LibSpeexContext { SpeexBits bits; SpeexStereoState stereo; void *dec_state; int frame_size; } LibSpeexContext; static av_cold int libspeex_decode_init(AVCodecContext *avctx) { LibSpeexContext *s = avctx->priv_data; const SpeexMode *mode; SpeexHeader *header = NULL; int spx_mode; avctx->sample_fmt = AV_SAMPLE_FMT_S16; if (avctx->extradata && avctx->extradata_size >= 80) { header = speex_packet_to_header(avctx->extradata, avctx->extradata_size); if (!header) av_log(avctx, AV_LOG_WARNING, "Invalid Speex header\n"); } if (header) { avctx->channels = header->nb_channels; spx_mode = header->mode; speex_header_free(header); } else { switch (avctx->sample_rate) { case 8000: spx_mode = 0; break; case 16000: spx_mode = 1; break; case 32000: spx_mode = 2; break; default: /* libspeex can handle any mode if initialized as ultra-wideband */ av_log(avctx, AV_LOG_WARNING, "Invalid sample rate: %d\n" "Decoding as 32kHz ultra-wideband\n", avctx->sample_rate); spx_mode = 2; } } mode = speex_lib_get_mode(spx_mode); if (!mode) { av_log(avctx, AV_LOG_ERROR, "Unknown Speex mode %d", spx_mode); return AVERROR_INVALIDDATA; } avctx->sample_rate = 8000 << spx_mode; s->frame_size = 160 << spx_mode; if (avctx->channels < 1 || avctx->channels > 2) { /* libspeex can handle mono or stereo if initialized as stereo */ av_log(avctx, AV_LOG_ERROR, "Invalid channel count: %d.\n" "Decoding as stereo.\n", avctx->channels); avctx->channels = 2; } avctx->channel_layout = avctx->channels == 2 ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO; speex_bits_init(&s->bits); s->dec_state = speex_decoder_init(mode); if (!s->dec_state) { av_log(avctx, AV_LOG_ERROR, "Error initializing libspeex decoder.\n"); return -1; } if (avctx->channels == 2) { SpeexCallback callback; callback.callback_id = SPEEX_INBAND_STEREO; callback.func = speex_std_stereo_request_handler; callback.data = &s->stereo; s->stereo = (SpeexStereoState)SPEEX_STEREO_STATE_INIT; speex_decoder_ctl(s->dec_state, SPEEX_SET_HANDLER, &callback); } return 0; } static int libspeex_decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt) { uint8_t *buf = avpkt->data; int buf_size = avpkt->size; LibSpeexContext *s = avctx->priv_data; AVFrame *frame = data; int16_t *output; int ret, consumed = 0; /* get output buffer */ frame->nb_samples = s->frame_size; if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) { av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); return ret; } output = (int16_t *)frame->data[0]; /* if there is not enough data left for the smallest possible frame or the next 5 bits are a terminator code, reset the libspeex buffer using the current packet, otherwise ignore the current packet and keep decoding frames from the libspeex buffer. */ if (speex_bits_remaining(&s->bits) < 5 || speex_bits_peek_unsigned(&s->bits, 5) == 0xF) { /* check for flush packet */ if (!buf || !buf_size) { *got_frame_ptr = 0; return buf_size; } /* set new buffer */ speex_bits_read_from(&s->bits, buf, buf_size); consumed = buf_size; } /* decode a single frame */ ret = speex_decode_int(s->dec_state, &s->bits, output); if (ret <= -2) { av_log(avctx, AV_LOG_ERROR, "Error decoding Speex frame.\n"); return AVERROR_INVALIDDATA; } if (avctx->channels == 2) speex_decode_stereo_int(output, s->frame_size, &s->stereo); *got_frame_ptr = 1; return consumed; } static av_cold int libspeex_decode_close(AVCodecContext *avctx) { LibSpeexContext *s = avctx->priv_data; speex_bits_destroy(&s->bits); speex_decoder_destroy(s->dec_state); return 0; } static av_cold void libspeex_decode_flush(AVCodecContext *avctx) { LibSpeexContext *s = avctx->priv_data; speex_bits_reset(&s->bits); } AVCodec ff_libspeex_decoder = { .name = "libspeex", .long_name = NULL_IF_CONFIG_SMALL("libspeex Speex"), .type = AVMEDIA_TYPE_AUDIO, .id = AV_CODEC_ID_SPEEX, .priv_data_size = sizeof(LibSpeexContext), .init = libspeex_decode_init, .close = libspeex_decode_close, .decode = libspeex_decode_frame, .flush = libspeex_decode_flush, .capabilities = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DELAY | AV_CODEC_CAP_DR1, };