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

/*
 * MPEG-2/4 AAC ADTS to MPEG-4 Audio Specific Configuration bitstream filter
 * Copyright (c) 2009 Alex Converse <alex.converse@gmail.com>
 *
 * 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 "avcodec.h"
#include "aacadtsdec.h"
#include "put_bits.h"
#include "get_bits.h"
#include "mpeg4audio.h"
#include "internal.h"

typedef struct AACBSFContext {
    int first_frame_done;
} AACBSFContext;

/**
 * This filter creates an MPEG-4 AudioSpecificConfig from an MPEG-2/4
 * ADTS header and removes the ADTS header.
 */
static int aac_adtstoasc_filter(AVBitStreamFilterContext *bsfc,
                                AVCodecContext *avctx, const char *args,
                                uint8_t  **poutbuf, int *poutbuf_size,
                                const uint8_t *buf, int      buf_size,
                                int keyframe)
{
    GetBitContext gb;
    PutBitContext pb;
    AACADTSHeaderInfo hdr;

    AACBSFContext *ctx = bsfc->priv_data;

    init_get_bits(&gb, buf, AAC_ADTS_HEADER_SIZE*8);

    *poutbuf = (uint8_t*) buf;
    *poutbuf_size = buf_size;

    if (avctx->extradata)
        if (show_bits(&gb, 12) != 0xfff)
            return 0;

    if (avpriv_aac_parse_header(&gb, &hdr) < 0) {
        av_log(avctx, AV_LOG_ERROR, "Error parsing ADTS frame header!\n");
        return AVERROR_INVALIDDATA;
    }

    if (!hdr.crc_absent && hdr.num_aac_frames > 1) {
        avpriv_report_missing_feature(avctx,
                                      "Multiple RDBs per frame with CRC");
        return AVERROR_PATCHWELCOME;
    }

    buf      += AAC_ADTS_HEADER_SIZE + 2*!hdr.crc_absent;
    buf_size -= AAC_ADTS_HEADER_SIZE + 2*!hdr.crc_absent;

    if (!ctx->first_frame_done) {
        int            pce_size = 0;
        uint8_t        pce_data[MAX_PCE_SIZE];
        if (!hdr.chan_config) {
            init_get_bits(&gb, buf, buf_size * 8);
            if (get_bits(&gb, 3) != 5) {
                avpriv_report_missing_feature(avctx,
                                              "PCE-based channel configuration "
                                              "without PCE as first syntax "
                                              "element");
                return AVERROR_PATCHWELCOME;
            }
            init_put_bits(&pb, pce_data, MAX_PCE_SIZE);
            pce_size = avpriv_copy_pce_data(&pb, &gb)/8;
            flush_put_bits(&pb);
            buf_size -= get_bits_count(&gb)/8;
            buf      += get_bits_count(&gb)/8;
        }
        av_free(avctx->extradata);
        avctx->extradata_size = 2 + pce_size;
        avctx->extradata = av_mallocz(avctx->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

        init_put_bits(&pb, avctx->extradata, avctx->extradata_size);
        put_bits(&pb, 5, hdr.object_type);
        put_bits(&pb, 4, hdr.sampling_index);
        put_bits(&pb, 4, hdr.chan_config);
        put_bits(&pb, 1, 0); //frame length - 1024 samples
        put_bits(&pb, 1, 0); //does not depend on core coder
        put_bits(&pb, 1, 0); //is not extension
        flush_put_bits(&pb);
        if (pce_size) {
            memcpy(avctx->extradata + 2, pce_data, pce_size);
        }

        ctx->first_frame_done = 1;
    }

    *poutbuf = (uint8_t*) buf;
    *poutbuf_size = buf_size;

    return 0;
}

AVBitStreamFilter ff_aac_adtstoasc_bsf = {
    .name           = "aac_adtstoasc",
    .priv_data_size = sizeof(AACBSFContext),
    .filter         = aac_adtstoasc_filter,
};
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* MPEG-2/4 AAC ADTS to MPEG-4 Audio Specific Configuration bitstream filter
	3	* Copyright (c) 2009 Alex Converse <alex.converse@gmail.com>
	4	*
	5	* This file is part of FFmpeg.
	6	*
	7	* FFmpeg is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU Lesser General Public
	9	* License as published by the Free Software Foundation; either
	10	* version 2.1 of the License, or (at your option) any later version.
	11	*
	12	* FFmpeg is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* Lesser General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU Lesser General Public
	18	* License along with FFmpeg; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	20	*/
	21
	22	#include "avcodec.h"
	23	#include "aacadtsdec.h"
	24	#include "put_bits.h"
	25	#include "get_bits.h"
	26	#include "mpeg4audio.h"
	27	#include "internal.h"
	28
	29	typedef struct AACBSFContext {
	30	int first_frame_done;
	31	} AACBSFContext;
	32
	33	/**
	34	* This filter creates an MPEG-4 AudioSpecificConfig from an MPEG-2/4
	35	* ADTS header and removes the ADTS header.
	36	*/
	37	static int aac_adtstoasc_filter(AVBitStreamFilterContext *bsfc,
	38	AVCodecContext avctx, const char args,
	39	uint8_t *poutbuf, int poutbuf_size,
	40	const uint8_t *buf, int buf_size,
	41	int keyframe)
	42	{
	43	GetBitContext gb;
	44	PutBitContext pb;
	45	AACADTSHeaderInfo hdr;
	46
	47	AACBSFContext *ctx = bsfc->priv_data;
	48
	49	init_get_bits(&gb, buf, AAC_ADTS_HEADER_SIZE*8);
	50
	51	poutbuf = (uint8_t) buf;
	52	*poutbuf_size = buf_size;
	53
	54	if (avctx->extradata)
	55	if (show_bits(&gb, 12) != 0xfff)
	56	return 0;
	57
	58	if (avpriv_aac_parse_header(&gb, &hdr) < 0) {
	59	av_log(avctx, AV_LOG_ERROR, "Error parsing ADTS frame header!\n");
	60	return AVERROR_INVALIDDATA;
	61	}
	62
	63	if (!hdr.crc_absent && hdr.num_aac_frames > 1) {
	64	avpriv_report_missing_feature(avctx,
65	"Multiple RDBs per frame with CRC");
66	return AVERROR_PATCHWELCOME;
67	}
68
69	buf += AAC_ADTS_HEADER_SIZE + 2*!hdr.crc_absent;
70	buf_size -= AAC_ADTS_HEADER_SIZE + 2*!hdr.crc_absent;
71
72	if (!ctx->first_frame_done) {
73	int pce_size = 0;
74	uint8_t pce_data[MAX_PCE_SIZE];
75	if (!hdr.chan_config) {
76	init_get_bits(&gb, buf, buf_size * 8);
77	if (get_bits(&gb, 3) != 5) {
78	avpriv_report_missing_feature(avctx,
79	"PCE-based channel configuration "
80	"without PCE as first syntax "
81	"element");
82	return AVERROR_PATCHWELCOME;
83	}
84	init_put_bits(&pb, pce_data, MAX_PCE_SIZE);
85	pce_size = avpriv_copy_pce_data(&pb, &gb)/8;
86	flush_put_bits(&pb);
87	buf_size -= get_bits_count(&gb)/8;
88	buf += get_bits_count(&gb)/8;
89	}
90	av_free(avctx->extradata);
91	avctx->extradata_size = 2 + pce_size;
92	avctx->extradata = av_mallocz(avctx->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
93
94	init_put_bits(&pb, avctx->extradata, avctx->extradata_size);
95	put_bits(&pb, 5, hdr.object_type);
96	put_bits(&pb, 4, hdr.sampling_index);
97	put_bits(&pb, 4, hdr.chan_config);
98	put_bits(&pb, 1, 0); //frame length - 1024 samples
99	put_bits(&pb, 1, 0); //does not depend on core coder
100	put_bits(&pb, 1, 0); //is not extension
101	flush_put_bits(&pb);
102	if (pce_size) {
103	memcpy(avctx->extradata + 2, pce_data, pce_size);
104	}
105
106	ctx->first_frame_done = 1;
107	}
108
109	poutbuf = (uint8_t) buf;
110	*poutbuf_size = buf_size;
111
112	return 0;
113	}
114
115	AVBitStreamFilter ff_aac_adtstoasc_bsf = {
116	.name = "aac_adtstoasc",
117	.priv_data_size = sizeof(AACBSFContext),
118	.filter = aac_adtstoasc_filter,
119	};