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a247ac640d
Given that the AVCodec.next pointer has now been removed, most of the AVCodecs are not modified at all any more and can therefore be made const (as this patch does); the only exceptions are the very few codecs for external libraries that have a init_static_data callback. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com> Signed-off-by: James Almer <jamrial@gmail.com>
154 lines
4.9 KiB
C
154 lines
4.9 KiB
C
/*
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* Interface to libgsm for GSM encoding
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* Copyright (c) 2005 Alban Bedel <albeu@free.fr>
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* Copyright (c) 2006, 2007 Michel Bardiaux <mbardiaux@mediaxim.be>
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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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* Interface to libgsm for GSM encoding
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*/
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// The idiosyncrasies of GSM-in-WAV are explained at http://kbs.cs.tu-berlin.de/~jutta/toast.html
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#include "config.h"
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#if HAVE_GSM_H
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#include <gsm.h>
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#else
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#include <gsm/gsm.h>
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#endif
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#include "libavutil/common.h"
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#include "avcodec.h"
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#include "internal.h"
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#include "gsm.h"
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static av_cold int libgsm_encode_close(AVCodecContext *avctx) {
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gsm_destroy(avctx->priv_data);
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avctx->priv_data = NULL;
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return 0;
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}
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static av_cold int libgsm_encode_init(AVCodecContext *avctx) {
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if (avctx->channels > 1) {
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av_log(avctx, AV_LOG_ERROR, "Mono required for GSM, got %d channels\n",
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avctx->channels);
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return -1;
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}
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if (avctx->sample_rate != 8000) {
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av_log(avctx, AV_LOG_ERROR, "Sample rate 8000Hz required for GSM, got %dHz\n",
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avctx->sample_rate);
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if (avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL)
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return -1;
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}
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if (avctx->bit_rate != 13000 /* Official */ &&
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avctx->bit_rate != 13200 /* Very common */ &&
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avctx->bit_rate != 0 /* Unknown; a.o. mov does not set bitrate when decoding */ ) {
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av_log(avctx, AV_LOG_ERROR, "Bitrate 13000bps required for GSM, got %"PRId64"bps\n",
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avctx->bit_rate);
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if (avctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL)
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return -1;
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}
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avctx->priv_data = gsm_create();
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if (!avctx->priv_data)
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goto error;
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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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int one = 1;
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gsm_option(avctx->priv_data, GSM_OPT_WAV49, &one);
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avctx->frame_size = 2*GSM_FRAME_SIZE;
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avctx->block_align = GSM_MS_BLOCK_SIZE;
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}
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}
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return 0;
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error:
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libgsm_encode_close(avctx);
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return -1;
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}
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static int libgsm_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
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const AVFrame *frame, int *got_packet_ptr)
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{
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int ret;
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gsm_signal *samples = (gsm_signal *)frame->data[0];
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struct gsm_state *state = avctx->priv_data;
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if ((ret = ff_alloc_packet2(avctx, avpkt, avctx->block_align, 0)) < 0)
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return ret;
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switch(avctx->codec_id) {
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case AV_CODEC_ID_GSM:
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gsm_encode(state, samples, avpkt->data);
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break;
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case AV_CODEC_ID_GSM_MS:
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gsm_encode(state, samples, avpkt->data);
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gsm_encode(state, samples + GSM_FRAME_SIZE, avpkt->data + 32);
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}
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*got_packet_ptr = 1;
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return 0;
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}
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static const AVCodecDefault libgsm_defaults[] = {
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{ "b", "13000" },
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{ NULL },
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};
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#if CONFIG_LIBGSM_ENCODER
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const AVCodec ff_libgsm_encoder = {
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.name = "libgsm",
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.long_name = NULL_IF_CONFIG_SMALL("libgsm GSM"),
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.type = AVMEDIA_TYPE_AUDIO,
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.id = AV_CODEC_ID_GSM,
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.init = libgsm_encode_init,
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.encode2 = libgsm_encode_frame,
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.close = libgsm_encode_close,
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.defaults = libgsm_defaults,
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.channel_layouts= (const uint64_t[]) { AV_CH_LAYOUT_MONO, 0 },
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.sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
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AV_SAMPLE_FMT_NONE },
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.wrapper_name = "libgsm",
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};
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#endif
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#if CONFIG_LIBGSM_MS_ENCODER
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const AVCodec ff_libgsm_ms_encoder = {
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.name = "libgsm_ms",
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.long_name = NULL_IF_CONFIG_SMALL("libgsm 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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.init = libgsm_encode_init,
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.encode2 = libgsm_encode_frame,
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.close = libgsm_encode_close,
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.defaults = libgsm_defaults,
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.channel_layouts= (const uint64_t[]) { AV_CH_LAYOUT_MONO, 0 },
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.sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
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AV_SAMPLE_FMT_NONE },
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.wrapper_name = "libgsm",
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};
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#endif
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