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20f9727018
Up until now, codec.h contains both public and private parts of AVCodec. This exposes the internals of AVCodec to users and leads them into the temptation of actually using them and forces us to forward-declare structures and types that users can't use at all. This commit changes this by adding a new structure FFCodec to codec_internal.h that extends AVCodec, i.e. contains the public AVCodec as first member; the private fields of AVCodec are moved to this structure, leaving codec.h clean. Reviewed-by: Anton Khirnov <anton@khirnov.net> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
144 lines
4.4 KiB
C
144 lines
4.4 KiB
C
/*
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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 "config_components.h"
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#include "libavutil/channel_layout.h"
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#include "avcodec.h"
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#include "codec_internal.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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av_channel_layout_uninit(&avctx->ch_layout);
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avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
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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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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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if (!avctx->block_align)
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avctx->block_align = GSM_MS_BLOCK_SIZE;
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else
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if (avctx->block_align < MSN_MIN_BLOCK_SIZE ||
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avctx->block_align > GSM_MS_BLOCK_SIZE ||
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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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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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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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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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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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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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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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const FFCodec ff_gsm_decoder = {
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.p.name = "gsm",
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.p.long_name = NULL_IF_CONFIG_SMALL("GSM"),
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.p.type = AVMEDIA_TYPE_AUDIO,
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.p.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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.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
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};
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#endif
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#if CONFIG_GSM_MS_DECODER
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const FFCodec ff_gsm_ms_decoder = {
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.p.name = "gsm_ms",
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.p.long_name = NULL_IF_CONFIG_SMALL("GSM Microsoft variant"),
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.p.type = AVMEDIA_TYPE_AUDIO,
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.p.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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.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
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};
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#endif
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