mirror of https://github.com/FFmpeg/FFmpeg.git
This BSF is supposed to be used in conjunction with mp3_header_compress,
which has been removed more than ten years ago in commit
c6080d8900. It mangled the headers
by removing the CRC field as well as fields that are supposed
to stay constant for the entirety of a stream (which are put into
extradata). This made these files unplayable; they need to be
decompressed with the BSF first (which does not happen automatically).
Even in this case the CRC does not get restored.
I am not aware that such compressed files exist at all; therefore
this commit removes the BSF completely.
Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
release/7.0
Andreas Rheinhardt
1 year ago
parent
e70e9b6554
commit
1e98cc4787
6 changed files with 1 additions and 138 deletions
@ -1,130 +0,0 @@ |
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/*
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* copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> |
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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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#include "libavutil/common.h" |
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#include "libavutil/intreadwrite.h" |
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#include "bsf.h" |
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#include "bsf_internal.h" |
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#include "defs.h" |
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#include "mpegaudiodecheader.h" |
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#include "mpegaudiodata.h" |
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static int mp3_header_decompress(AVBSFContext *ctx, AVPacket *out) |
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{ |
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AVPacket *in; |
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uint32_t header; |
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int sample_rate= ctx->par_in->sample_rate; |
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int sample_rate_index=0; |
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int lsf, mpeg25, bitrate_index, frame_size, ret; |
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uint8_t *buf; |
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int buf_size; |
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ret = ff_bsf_get_packet(ctx, &in); |
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if (ret < 0) |
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return ret; |
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buf = in->data; |
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buf_size = in->size; |
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header = AV_RB32(buf); |
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if(ff_mpa_check_header(header) >= 0){ |
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av_packet_move_ref(out, in); |
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av_packet_free(&in); |
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return 0; |
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} |
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if(ctx->par_in->extradata_size != 15 || strcmp(ctx->par_in->extradata, "FFCMP3 0.0")){ |
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av_log(ctx, AV_LOG_ERROR, "Extradata invalid %d\n", ctx->par_in->extradata_size); |
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ret = AVERROR(EINVAL); |
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goto fail; |
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} |
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header= AV_RB32(ctx->par_in->extradata+11) & MP3_MASK; |
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lsf = sample_rate < (24000+32000)/2; |
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mpeg25 = sample_rate < (12000+16000)/2; |
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sample_rate_index= (header>>10)&3; |
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if (sample_rate_index == 3) { |
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ret = AVERROR_INVALIDDATA; |
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goto fail; |
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} |
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sample_rate = ff_mpa_freq_tab[sample_rate_index] >> (lsf + mpeg25); //in case sample rate is a little off
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for(bitrate_index=2; bitrate_index<30; bitrate_index++){ |
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frame_size = ff_mpa_bitrate_tab[lsf][2][bitrate_index>>1]; |
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frame_size = (frame_size * 144000) / (sample_rate << lsf) + (bitrate_index&1); |
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if(frame_size == buf_size + 4) |
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break; |
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if(frame_size == buf_size + 6) |
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break; |
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} |
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if(bitrate_index == 30){ |
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av_log(ctx, AV_LOG_ERROR, "Could not find bitrate_index.\n"); |
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ret = AVERROR(EINVAL); |
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goto fail; |
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} |
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header |= (bitrate_index&1)<<9; |
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header |= (bitrate_index>>1)<<12; |
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header |= (frame_size == buf_size + 4)<<16; //FIXME actually set a correct crc instead of 0
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ret = av_new_packet(out, frame_size); |
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if (ret < 0) |
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goto fail; |
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ret = av_packet_copy_props(out, in); |
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if (ret < 0) { |
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av_packet_unref(out); |
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goto fail; |
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} |
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memcpy(out->data + frame_size - buf_size, buf, buf_size + AV_INPUT_BUFFER_PADDING_SIZE); |
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if (ctx->par_in->ch_layout.nb_channels == 2){ |
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uint8_t *p= out->data + frame_size - buf_size; |
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if(lsf){ |
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FFSWAP(int, p[1], p[2]); |
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header |= (p[1] & 0xC0)>>2; |
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p[1] &= 0x3F; |
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}else{ |
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header |= p[1] & 0x30; |
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p[1] &= 0xCF; |
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} |
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} |
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AV_WB32(out->data, header); |
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ret = 0; |
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fail: |
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av_packet_free(&in); |
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return ret; |
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} |
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static const enum AVCodecID codec_ids[] = { |
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AV_CODEC_ID_MP3, AV_CODEC_ID_NONE, |
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}; |
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const FFBitStreamFilter ff_mp3_header_decompress_bsf = { |
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.p.name = "mp3decomp", |
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.p.codec_ids = codec_ids, |
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.filter = mp3_header_decompress, |
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}; |
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