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/* |
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* gsm 06.10 decoder |
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* Copyright (c) 2010 Reimar Döffinger <Reimar.Doeffinger@gmx.de> |
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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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/** |
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* @file |
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* GSM decoder |
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*/ |
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#include "libavutil/channel_layout.h" |
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#include "avcodec.h" |
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#include "get_bits.h" |
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#include "internal.h" |
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#include "msgsmdec.h" |
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#include "gsmdec_template.c" |
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static av_cold int gsm_init(AVCodecContext *avctx) |
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{ |
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avctx->channels = 1; |
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avctx->channel_layout = AV_CH_LAYOUT_MONO; |
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✗✓ |
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if (!avctx->sample_rate) |
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avctx->sample_rate = 8000; |
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avctx->sample_fmt = AV_SAMPLE_FMT_S16; |
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✓✓✗ |
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switch (avctx->codec_id) { |
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case AV_CODEC_ID_GSM: |
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avctx->frame_size = GSM_FRAME_SIZE; |
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avctx->block_align = GSM_BLOCK_SIZE; |
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break; |
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case AV_CODEC_ID_GSM_MS: |
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avctx->frame_size = 2 * GSM_FRAME_SIZE; |
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✗✓ |
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if (!avctx->block_align) |
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avctx->block_align = GSM_MS_BLOCK_SIZE; |
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else |
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✓✗ |
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if (avctx->block_align < MSN_MIN_BLOCK_SIZE || |
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✓✗ |
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avctx->block_align > GSM_MS_BLOCK_SIZE || |
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✗✓ |
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(avctx->block_align - MSN_MIN_BLOCK_SIZE) % 3) { |
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av_log(avctx, AV_LOG_ERROR, "Invalid block alignment %d\n", |
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avctx->block_align); |
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return AVERROR_INVALIDDATA; |
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} |
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} |
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return 0; |
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} |
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static int gsm_decode_frame(AVCodecContext *avctx, void *data, |
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int *got_frame_ptr, AVPacket *avpkt) |
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{ |
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AVFrame *frame = data; |
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int res; |
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GetBitContext gb; |
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const uint8_t *buf = avpkt->data; |
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int buf_size = avpkt->size; |
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int16_t *samples; |
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✗✓ |
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if (buf_size < avctx->block_align) { |
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av_log(avctx, AV_LOG_ERROR, "Packet is too small\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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/* get output buffer */ |
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frame->nb_samples = avctx->frame_size; |
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✗✓ |
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if ((res = ff_get_buffer(avctx, frame, 0)) < 0) |
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return res; |
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samples = (int16_t *)frame->data[0]; |
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✓✓✗ |
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switch (avctx->codec_id) { |
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case AV_CODEC_ID_GSM: |
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init_get_bits(&gb, buf, buf_size * 8); |
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✗✓ |
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if (get_bits(&gb, 4) != 0xd) |
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av_log(avctx, AV_LOG_WARNING, "Missing GSM magic!\n"); |
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res = gsm_decode_block(avctx, samples, &gb, GSM_13000); |
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✗✓ |
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if (res < 0) |
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return res; |
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break; |
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case AV_CODEC_ID_GSM_MS: |
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res = ff_msgsm_decode_block(avctx, samples, buf, |
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(GSM_MS_BLOCK_SIZE - avctx->block_align) / 3); |
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✗✓ |
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if (res < 0) |
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return res; |
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} |
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*got_frame_ptr = 1; |
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return avctx->block_align; |
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} |
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static void gsm_flush(AVCodecContext *avctx) |
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{ |
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GSMContext *s = avctx->priv_data; |
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memset(s, 0, sizeof(*s)); |
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} |
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#if CONFIG_GSM_DECODER |
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AVCodec ff_gsm_decoder = { |
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.name = "gsm", |
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.long_name = NULL_IF_CONFIG_SMALL("GSM"), |
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.type = AVMEDIA_TYPE_AUDIO, |
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.id = AV_CODEC_ID_GSM, |
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.priv_data_size = sizeof(GSMContext), |
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.init = gsm_init, |
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.decode = gsm_decode_frame, |
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.flush = gsm_flush, |
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.capabilities = AV_CODEC_CAP_DR1, |
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}; |
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#endif |
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#if CONFIG_GSM_MS_DECODER |
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AVCodec ff_gsm_ms_decoder = { |
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.name = "gsm_ms", |
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.long_name = NULL_IF_CONFIG_SMALL("GSM Microsoft variant"), |
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.type = AVMEDIA_TYPE_AUDIO, |
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.id = AV_CODEC_ID_GSM_MS, |
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.priv_data_size = sizeof(GSMContext), |
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.init = gsm_init, |
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.decode = gsm_decode_frame, |
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.flush = gsm_flush, |
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.capabilities = AV_CODEC_CAP_DR1, |
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}; |
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#endif |