[deb_ffmpeg.git] / ffmpeg / libavcodec / libspeexdec.c

/*
 * Copyright (C) 2008 David Conrad
 *
 * 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
 */

#include <speex/speex.h>
#include <speex/speex_header.h>
#include <speex/speex_stereo.h>
#include <speex/speex_callbacks.h>

#include "libavutil/channel_layout.h"
#include "libavutil/common.h"
#include "avcodec.h"
#include "internal.h"

typedef struct {
    SpeexBits bits;
    SpeexStereoState stereo;
    void *dec_state;
    int frame_size;
} LibSpeexContext;


static av_cold int libspeex_decode_init(AVCodecContext *avctx)
{
    LibSpeexContext *s = avctx->priv_data;
    const SpeexMode *mode;
    SpeexHeader *header = NULL;
    int spx_mode;

    if (avctx->extradata && avctx->extradata_size >= 80) {
        header = speex_packet_to_header(avctx->extradata,
                                        avctx->extradata_size);
        if (!header)
            av_log(avctx, AV_LOG_WARNING, "Invalid Speex header\n");
    }
    if (avctx->codec_tag == MKTAG('S', 'P', 'X', 'N')) {
        if (!avctx->extradata || avctx->extradata && avctx->extradata_size < 47) {
            av_log(avctx, AV_LOG_ERROR, "Missing or invalid extradata.\n");
            return AVERROR_INVALIDDATA;
        }
        if (avctx->extradata[37] != 10) {
            av_log(avctx, AV_LOG_ERROR, "Unsupported quality mode.\n");
            return AVERROR_PATCHWELCOME;
        }
        spx_mode           = 0;
    } else if (header) {
        avctx->sample_rate = header->rate;
        avctx->channels    = header->nb_channels;
        spx_mode           = header->mode;
        speex_header_free(header);
    } else {
        switch (avctx->sample_rate) {
        case 8000:  spx_mode = 0; break;
        case 16000: spx_mode = 1; break;
        case 32000: spx_mode = 2; break;
        default:
            /* libspeex can handle any mode if initialized as ultra-wideband */
            av_log(avctx, AV_LOG_WARNING, "Invalid sample rate: %d\n"
                                          "Decoding as 32kHz ultra-wideband\n",
                                          avctx->sample_rate);
            spx_mode = 2;
        }
    }

    mode = speex_lib_get_mode(spx_mode);
    if (!mode) {
        av_log(avctx, AV_LOG_ERROR, "Unknown Speex mode %d", spx_mode);
        return AVERROR_INVALIDDATA;
    }
    s->frame_size      =  160 << spx_mode;
    if (!avctx->sample_rate)
        avctx->sample_rate = 8000 << spx_mode;

    if (avctx->channels < 1 || avctx->channels > 2) {
        /* libspeex can handle mono or stereo if initialized as stereo */
        av_log(avctx, AV_LOG_ERROR, "Invalid channel count: %d.\n"
                                    "Decoding as stereo.\n", avctx->channels);
        avctx->channels = 2;
    }
    avctx->channel_layout = avctx->channels == 2 ? AV_CH_LAYOUT_STEREO :
                                                   AV_CH_LAYOUT_MONO;

    speex_bits_init(&s->bits);
    s->dec_state = speex_decoder_init(mode);
    if (!s->dec_state) {
        av_log(avctx, AV_LOG_ERROR, "Error initializing libspeex decoder.\n");
        return -1;
    }

    if (avctx->channels == 2) {
        SpeexCallback callback;
        callback.callback_id = SPEEX_INBAND_STEREO;
        callback.func = speex_std_stereo_request_handler;
        callback.data = &s->stereo;
        s->stereo = (SpeexStereoState)SPEEX_STEREO_STATE_INIT;
        speex_decoder_ctl(s->dec_state, SPEEX_SET_HANDLER, &callback);
    }

    return 0;
}

static int libspeex_decode_frame(AVCodecContext *avctx, void *data,
                                 int *got_frame_ptr, AVPacket *avpkt)
{
    uint8_t *buf = avpkt->data;
    int buf_size = avpkt->size;
    LibSpeexContext *s = avctx->priv_data;
    AVFrame *frame     = data;
    int16_t *output;
    int ret, consumed = 0;
    avctx->sample_fmt = AV_SAMPLE_FMT_S16;

    /* get output buffer */
    frame->nb_samples = s->frame_size;
    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
        return ret;
    output = (int16_t *)frame->data[0];

    /* if there is not enough data left for the smallest possible frame or the
       next 5 bits are a terminator code, reset the libspeex buffer using the
       current packet, otherwise ignore the current packet and keep decoding
       frames from the libspeex buffer. */
    if (speex_bits_remaining(&s->bits) < 5 ||
        speex_bits_peek_unsigned(&s->bits, 5) == 0xF) {
        /* check for flush packet */
        if (!buf || !buf_size) {
            *got_frame_ptr = 0;
            return buf_size;
        }
        /* set new buffer */
        speex_bits_read_from(&s->bits, buf, buf_size);
        consumed = buf_size;
    }

    /* decode a single frame */
    ret = speex_decode_int(s->dec_state, &s->bits, output);
    if (ret <= -2) {
        av_log(avctx, AV_LOG_ERROR, "Error decoding Speex frame.\n");
        return AVERROR_INVALIDDATA;
    }
    if (avctx->channels == 2)
        speex_decode_stereo_int(output, s->frame_size, &s->stereo);

    *got_frame_ptr = 1;

    if (!avctx->bit_rate)
        speex_decoder_ctl(s->dec_state, SPEEX_GET_BITRATE, &avctx->bit_rate);
    return consumed;
}

static av_cold int libspeex_decode_close(AVCodecContext *avctx)
{
    LibSpeexContext *s = avctx->priv_data;

    speex_bits_destroy(&s->bits);
    speex_decoder_destroy(s->dec_state);

    return 0;
}

static av_cold void libspeex_decode_flush(AVCodecContext *avctx)
{
    LibSpeexContext *s = avctx->priv_data;
    speex_bits_reset(&s->bits);
}

AVCodec ff_libspeex_decoder = {
    .name           = "libspeex",
    .long_name      = NULL_IF_CONFIG_SMALL("libspeex Speex"),
    .type           = AVMEDIA_TYPE_AUDIO,
    .id             = AV_CODEC_ID_SPEEX,
    .priv_data_size = sizeof(LibSpeexContext),
    .init           = libspeex_decode_init,
    .close          = libspeex_decode_close,
    .decode         = libspeex_decode_frame,
    .flush          = libspeex_decode_flush,
    .capabilities   = CODEC_CAP_SUBFRAMES | CODEC_CAP_DELAY | CODEC_CAP_DR1,
};
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* Copyright (C) 2008 David Conrad
	3	*
	4	* This file is part of FFmpeg.
	5	*
	6	* FFmpeg is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU Lesser General Public
	8	* License as published by the Free Software Foundation; either
	9	* version 2.1 of the License, or (at your option) any later version.
	10	*
	11	* FFmpeg is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	* Lesser General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU Lesser General Public
	17	* License along with FFmpeg; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	19	*/
	20
	21	#include <speex/speex.h>
	22	#include <speex/speex_header.h>
	23	#include <speex/speex_stereo.h>
	24	#include <speex/speex_callbacks.h>
	25
	26	#include "libavutil/channel_layout.h"
	27	#include "libavutil/common.h"
	28	#include "avcodec.h"
	29	#include "internal.h"
	30
	31	typedef struct {
	32	SpeexBits bits;
	33	SpeexStereoState stereo;
	34	void *dec_state;
	35	int frame_size;
	36	} LibSpeexContext;
	37
	38
	39	static av_cold int libspeex_decode_init(AVCodecContext *avctx)
	40	{
	41	LibSpeexContext *s = avctx->priv_data;
	42	const SpeexMode *mode;
	43	SpeexHeader *header = NULL;
	44	int spx_mode;
	45
	46	if (avctx->extradata && avctx->extradata_size >= 80) {
	47	header = speex_packet_to_header(avctx->extradata,
	48	avctx->extradata_size);
	49	if (!header)
	50	av_log(avctx, AV_LOG_WARNING, "Invalid Speex header\n");
	51	}
	52	if (avctx->codec_tag == MKTAG('S', 'P', 'X', 'N')) {
	53	if (!avctx->extradata \|\| avctx->extradata && avctx->extradata_size < 47) {
	54	av_log(avctx, AV_LOG_ERROR, "Missing or invalid extradata.\n");
	55	return AVERROR_INVALIDDATA;
	56	}
	57	if (avctx->extradata[37] != 10) {
	58	av_log(avctx, AV_LOG_ERROR, "Unsupported quality mode.\n");
	59	return AVERROR_PATCHWELCOME;
	60	}
	61	spx_mode = 0;
	62	} else if (header) {
	63	avctx->sample_rate = header->rate;
	64	avctx->channels = header->nb_channels;
65	spx_mode = header->mode;
66	speex_header_free(header);
67	} else {
68	switch (avctx->sample_rate) {
69	case 8000: spx_mode = 0; break;
70	case 16000: spx_mode = 1; break;
71	case 32000: spx_mode = 2; break;
72	default:
73	/* libspeex can handle any mode if initialized as ultra-wideband */
74	av_log(avctx, AV_LOG_WARNING, "Invalid sample rate: %d\n"
75	"Decoding as 32kHz ultra-wideband\n",
76	avctx->sample_rate);
77	spx_mode = 2;
78	}
79	}
80
81	mode = speex_lib_get_mode(spx_mode);
82	if (!mode) {
83	av_log(avctx, AV_LOG_ERROR, "Unknown Speex mode %d", spx_mode);
84	return AVERROR_INVALIDDATA;
85	}
86	s->frame_size = 160 << spx_mode;
87	if (!avctx->sample_rate)
88	avctx->sample_rate = 8000 << spx_mode;
89
90	if (avctx->channels < 1 \|\| avctx->channels > 2) {
91	/* libspeex can handle mono or stereo if initialized as stereo */
92	av_log(avctx, AV_LOG_ERROR, "Invalid channel count: %d.\n"
93	"Decoding as stereo.\n", avctx->channels);
94	avctx->channels = 2;
95	}
96	avctx->channel_layout = avctx->channels == 2 ? AV_CH_LAYOUT_STEREO :
97	AV_CH_LAYOUT_MONO;
98
99	speex_bits_init(&s->bits);
100	s->dec_state = speex_decoder_init(mode);
101	if (!s->dec_state) {
102	av_log(avctx, AV_LOG_ERROR, "Error initializing libspeex decoder.\n");
103	return -1;
104	}
105
106	if (avctx->channels == 2) {
107	SpeexCallback callback;
108	callback.callback_id = SPEEX_INBAND_STEREO;
109	callback.func = speex_std_stereo_request_handler;
110	callback.data = &s->stereo;
111	s->stereo = (SpeexStereoState)SPEEX_STEREO_STATE_INIT;
112	speex_decoder_ctl(s->dec_state, SPEEX_SET_HANDLER, &callback);
113	}
114
115	return 0;
116	}
117
118	static int libspeex_decode_frame(AVCodecContext avctx, void data,
119	int got_frame_ptr, AVPacket avpkt)
120	{
121	uint8_t *buf = avpkt->data;
122	int buf_size = avpkt->size;
123	LibSpeexContext *s = avctx->priv_data;
124	AVFrame *frame = data;
125	int16_t *output;
126	int ret, consumed = 0;
127	avctx->sample_fmt = AV_SAMPLE_FMT_S16;
128
129	/* get output buffer */
130	frame->nb_samples = s->frame_size;
131	if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
132	return ret;
133	output = (int16_t *)frame->data[0];
134
135	/* if there is not enough data left for the smallest possible frame or the
136	next 5 bits are a terminator code, reset the libspeex buffer using the
137	current packet, otherwise ignore the current packet and keep decoding
138	frames from the libspeex buffer. */
139	if (speex_bits_remaining(&s->bits) < 5 \|\|
140	speex_bits_peek_unsigned(&s->bits, 5) == 0xF) {
141	/* check for flush packet */
142	if (!buf \|\| !buf_size) {
143	*got_frame_ptr = 0;
144	return buf_size;
145	}
146	/* set new buffer */
147	speex_bits_read_from(&s->bits, buf, buf_size);
148	consumed = buf_size;
149	}
150
151	/* decode a single frame */
152	ret = speex_decode_int(s->dec_state, &s->bits, output);
153	if (ret <= -2) {
154	av_log(avctx, AV_LOG_ERROR, "Error decoding Speex frame.\n");
155	return AVERROR_INVALIDDATA;
156	}
157	if (avctx->channels == 2)
158	speex_decode_stereo_int(output, s->frame_size, &s->stereo);
159
160	*got_frame_ptr = 1;
161
162	if (!avctx->bit_rate)
163	speex_decoder_ctl(s->dec_state, SPEEX_GET_BITRATE, &avctx->bit_rate);
164	return consumed;
165	}
166
167	static av_cold int libspeex_decode_close(AVCodecContext *avctx)
168	{
169	LibSpeexContext *s = avctx->priv_data;
170
171	speex_bits_destroy(&s->bits);
172	speex_decoder_destroy(s->dec_state);
173
174	return 0;
175	}
176
177	static av_cold void libspeex_decode_flush(AVCodecContext *avctx)
178	{
179	LibSpeexContext *s = avctx->priv_data;
180	speex_bits_reset(&s->bits);
181	}
182
183	AVCodec ff_libspeex_decoder = {
184	.name = "libspeex",
185	.long_name = NULL_IF_CONFIG_SMALL("libspeex Speex"),
186	.type = AVMEDIA_TYPE_AUDIO,
187	.id = AV_CODEC_ID_SPEEX,
188	.priv_data_size = sizeof(LibSpeexContext),
189	.init = libspeex_decode_init,
190	.close = libspeex_decode_close,
191	.decode = libspeex_decode_frame,
192	.flush = libspeex_decode_flush,
193	.capabilities = CODEC_CAP_SUBFRAMES \| CODEC_CAP_DELAY \| CODEC_CAP_DR1,
194	};