/* * 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 "avcodec.h" #include <speex/speex.h> #include <speex/speex_header.h> #include <speex/speex_stereo.h> #include <speex/speex_callbacks.h> typedef struct { SpeexBits bits; SpeexStereoState stereo; void *dec_state; SpeexHeader *header; int frame_size; } LibSpeexContext; static av_cold int libspeex_decode_init(AVCodecContext *avctx) { LibSpeexContext *s = avctx->priv_data; const SpeexMode *mode; // defaults in the case of a missing header if (avctx->sample_rate <= 8000) mode = &speex_nb_mode; else if (avctx->sample_rate <= 16000) mode = &speex_wb_mode; else mode = &speex_uwb_mode; if (avctx->extradata_size >= 80) s->header = speex_packet_to_header(avctx->extradata, avctx->extradata_size); avctx->sample_fmt = AV_SAMPLE_FMT_S16; if (s->header) { avctx->sample_rate = s->header->rate; avctx->channels = s->header->nb_channels; avctx->frame_size = s->frame_size = s->header->frame_size; if (s->header->frames_per_packet) avctx->frame_size *= s->header->frames_per_packet; mode = speex_lib_get_mode(s->header->mode); if (!mode) { av_log(avctx, AV_LOG_ERROR, "Unknown Speex mode %d", s->header->mode); return -1; } } else av_log(avctx, AV_LOG_INFO, "Missing Speex header, assuming defaults.\n"); if (avctx->channels > 2) { av_log(avctx, AV_LOG_ERROR, "Only stereo and mono are supported.\n"); return -1; } 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 (!s->header) { speex_decoder_ctl(s->dec_state, SPEEX_GET_FRAME_SIZE, &s->frame_size); } 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 *data_size, AVPacket *avpkt) { const uint8_t *buf = avpkt->data; int buf_size = avpkt->size; LibSpeexContext *s = avctx->priv_data; int16_t *output = data, *end; int i, num_samples; num_samples = s->frame_size * avctx->channels; end = output + *data_size / sizeof(*output); speex_bits_read_from(&s->bits, buf, buf_size); for (i = 0; speex_bits_remaining(&s->bits) && output + num_samples < end; i++) { int 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 -1; } else if (ret == -1) // end of stream break; if (avctx->channels == 2) speex_decode_stereo_int(output, s->frame_size, &s->stereo); output += num_samples; } avctx->frame_size = s->frame_size * i; *data_size = avctx->channels * avctx->frame_size * sizeof(*output); return buf_size; } static av_cold int libspeex_decode_close(AVCodecContext *avctx) { LibSpeexContext *s = avctx->priv_data; speex_header_free(s->header); speex_bits_destroy(&s->bits); speex_decoder_destroy(s->dec_state); return 0; } AVCodec ff_libspeex_decoder = { "libspeex", AVMEDIA_TYPE_AUDIO, CODEC_ID_SPEEX, sizeof(LibSpeexContext), libspeex_decode_init, NULL, libspeex_decode_close, libspeex_decode_frame, .long_name = NULL_IF_CONFIG_SMALL("libspeex Speex"), };