/* * gsm 06.10 decoder * Copyright (c) 2010 Reimar Döffinger <Reimar.Doeffinger@gmx.de> * * 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 */ /** * @file * GSM decoder */ #include "avcodec.h" #include "get_bits.h" #include "msgsmdec.h" #include "gsmdec_template.c" static av_cold int gsm_init(AVCodecContext *avctx) { avctx->channels = 1; if (!avctx->sample_rate) avctx->sample_rate = 8000; avctx->sample_fmt = AV_SAMPLE_FMT_S16; switch (avctx->codec_id) { case CODEC_ID_GSM: avctx->frame_size = GSM_FRAME_SIZE; avctx->block_align = GSM_BLOCK_SIZE; break; case CODEC_ID_GSM_MS: avctx->frame_size = 2 * GSM_FRAME_SIZE; avctx->block_align = GSM_MS_BLOCK_SIZE; } return 0; } static int gsm_decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt) { int res; GetBitContext gb; const uint8_t *buf = avpkt->data; int buf_size = avpkt->size; int16_t *samples = data; int frame_bytes = 2 * avctx->frame_size; if (*data_size < frame_bytes) return -1; *data_size = 0; if(buf_size < avctx->block_align) return AVERROR_INVALIDDATA; switch (avctx->codec_id) { case CODEC_ID_GSM: init_get_bits(&gb, buf, buf_size * 8); if (get_bits(&gb, 4) != 0xd) av_log(avctx, AV_LOG_WARNING, "Missing GSM magic!\n"); res = gsm_decode_block(avctx, samples, &gb); if (res < 0) return res; break; case CODEC_ID_GSM_MS: res = ff_msgsm_decode_block(avctx, samples, buf); if (res < 0) return res; } *data_size = frame_bytes; return avctx->block_align; } AVCodec ff_gsm_decoder = { "gsm", AVMEDIA_TYPE_AUDIO, CODEC_ID_GSM, sizeof(GSMContext), gsm_init, NULL, NULL, gsm_decode_frame, .long_name = NULL_IF_CONFIG_SMALL("GSM"), }; AVCodec ff_gsm_ms_decoder = { "gsm_ms", AVMEDIA_TYPE_AUDIO, CODEC_ID_GSM_MS, sizeof(GSMContext), gsm_init, NULL, NULL, gsm_decode_frame, .long_name = NULL_IF_CONFIG_SMALL("GSM Microsoft variant"), };