b945fed629
Explicitly identify decoder/encoder wrappers with a common name. This
saves API users from guessing by the name suffix. For example, they
don't have to guess that "h264_qsv" is the h264 QSV implementation, and
instead they can just check the AVCodec .codec and .wrapper_name fields.
Explicitly mark AVCodec entries that are hardware decoders or most
likely hardware decoders with new AV_CODEC_CAPs. The purpose is allowing
API users listing hardware decoders in a more generic way. The proposed
AVCodecHWConfig does not provide this information fully, because it's
concerned with decoder configuration, not information about the fact
whether the hardware is used or not.
AV_CODEC_CAP_HYBRID exists specifically for QSV, which can have software
implementations in case the hardware is not capable.
Based on a patch by Philip Langdale <philipl@overt.org>.
Merges Libav commit 47687a2f8a.
156 lines
4.5 KiB
C
156 lines
4.5 KiB
C
/*
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* Interface to libgsm for GSM decoding
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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 decoding
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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/channel_layout.h"
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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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typedef struct LibGSMDecodeContext {
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struct gsm_state *state;
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} LibGSMDecodeContext;
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static av_cold int libgsm_decode_init(AVCodecContext *avctx) {
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LibGSMDecodeContext *s = avctx->priv_data;
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avctx->channels = 1;
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avctx->channel_layout = AV_CH_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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s->state = gsm_create();
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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(s->state, 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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}
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static av_cold int libgsm_decode_close(AVCodecContext *avctx) {
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LibGSMDecodeContext *s = avctx->priv_data;
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gsm_destroy(s->state);
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s->state = NULL;
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return 0;
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}
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static int libgsm_decode_frame(AVCodecContext *avctx, void *data,
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int *got_frame_ptr, AVPacket *avpkt)
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{
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int i, ret;
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LibGSMDecodeContext *s = avctx->priv_data;
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AVFrame *frame = data;
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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 ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
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return ret;
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samples = (int16_t *)frame->data[0];
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for (i = 0; i < avctx->frame_size / GSM_FRAME_SIZE; i++) {
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if ((ret = gsm_decode(s->state, buf, samples)) < 0)
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return -1;
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buf += GSM_BLOCK_SIZE;
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samples += GSM_FRAME_SIZE;
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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 libgsm_flush(AVCodecContext *avctx) {
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LibGSMDecodeContext *s = avctx->priv_data;
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int one = 1;
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gsm_destroy(s->state);
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s->state = gsm_create();
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if (avctx->codec_id == AV_CODEC_ID_GSM_MS)
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gsm_option(s->state, GSM_OPT_WAV49, &one);
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}
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#if CONFIG_LIBGSM_DECODER
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AVCodec ff_libgsm_decoder = {
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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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.priv_data_size = sizeof(LibGSMDecodeContext),
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.init = libgsm_decode_init,
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.close = libgsm_decode_close,
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.decode = libgsm_decode_frame,
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.flush = libgsm_flush,
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.capabilities = AV_CODEC_CAP_DR1,
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.wrapper_name = "libgsm",
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};
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#endif
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#if CONFIG_LIBGSM_MS_DECODER
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AVCodec ff_libgsm_ms_decoder = {
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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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.priv_data_size = sizeof(LibGSMDecodeContext),
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.init = libgsm_decode_init,
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.close = libgsm_decode_close,
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.decode = libgsm_decode_frame,
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.flush = libgsm_flush,
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.capabilities = AV_CODEC_CAP_DR1,
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.wrapper_name = "libgsm",
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};
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#endif
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