X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Fmpc7.c;h=28b51922ecc289f3cd3d60c2256050f84a683315;hb=3b8e895237592fdaffe87cdcd204104200b9ccf9;hp=ac57f4a62aa1323986e1697abb6027991ce7a4c7;hpb=88517e9f9d684e58a641cc77b68df377d82fad5b;p=ffmpeg diff --git a/libavcodec/mpc7.c b/libavcodec/mpc7.c index ac57f4a62aa..28b51922ecc 100644 --- a/libavcodec/mpc7.c +++ b/libavcodec/mpc7.c @@ -2,34 +2,36 @@ * Musepack SV7 decoder * Copyright (c) 2006 Konstantin Shishkov * - * This file is part of FFmpeg. + * This file is part of Libav. * - * FFmpeg is free software; you can redistribute it and/or + * Libav 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, + * Libav 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 + * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** - * @file libavcodec/mpc7.c Musepack SV7 decoder + * @file * MPEG Audio Layer 1/2 -like codec with frames of 1152 samples * divided into 32 subbands. */ +#include "libavutil/channel_layout.h" +#include "libavutil/internal.h" #include "libavutil/lfg.h" #include "avcodec.h" #include "get_bits.h" -#include "dsputil.h" -#include "mpegaudio.h" +#include "internal.h" +#include "mpegaudiodsp.h" #include "mpc.h" #include "mpc7data.h" @@ -52,7 +54,7 @@ static av_cold int mpc7_decode_init(AVCodecContext * avctx) int i, j; MPCContext *c = avctx->priv_data; GetBitContext gb; - uint8_t buf[16]; + LOCAL_ALIGNED_16(uint8_t, buf, [16]); static int vlc_initialized = 0; static VLC_TYPE scfi_table[1 << MPC7_SCFI_BITS][2]; @@ -60,14 +62,21 @@ static av_cold int mpc7_decode_init(AVCodecContext * avctx) static VLC_TYPE hdr_table[1 << MPC7_HDR_BITS][2]; static VLC_TYPE quant_tables[7224][2]; + /* Musepack SV7 is always stereo */ + if (avctx->channels != 2) { + avpriv_request_sample(avctx, "%d channels", avctx->channels); + return AVERROR_PATCHWELCOME; + } + if(avctx->extradata_size < 16){ av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size); return -1; } memset(c->oldDSCF, 0, sizeof(c->oldDSCF)); av_lfg_init(&c->rnd, 0xDEADBEEF); - dsputil_init(&c->dsp, avctx); - c->dsp.bswap_buf((uint32_t*)buf, (const uint32_t*)avctx->extradata, 4); + ff_bswapdsp_init(&c->bdsp); + ff_mpadsp_init(&c->mpadsp); + c->bdsp.bswap_buf((uint32_t *) buf, (const uint32_t *) avctx->extradata, 4); ff_mpc_init(); init_get_bits(&gb, buf, 128); @@ -85,8 +94,8 @@ static av_cold int mpc7_decode_init(AVCodecContext * avctx) c->IS, c->MSS, c->gapless, c->lastframelen, c->maxbands); c->frames_to_skip = 0; - avctx->sample_fmt = SAMPLE_FMT_S16; - avctx->channel_layout = (avctx->channels==2) ? CH_LAYOUT_STEREO : CH_LAYOUT_MONO; + avctx->sample_fmt = AV_SAMPLE_FMT_S16P; + avctx->channel_layout = AV_CH_LAYOUT_STEREO; if(vlc_initialized) return 0; av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n"); @@ -127,6 +136,7 @@ static av_cold int mpc7_decode_init(AVCodecContext * avctx) } } vlc_initialized = 1; + return 0; } @@ -180,40 +190,63 @@ static int get_scale_idx(GetBitContext *gb, int ref) int t = get_vlc2(gb, dscf_vlc.table, MPC7_DSCF_BITS, 1) - 7; if (t == 8) return get_bits(gb, 6); - return ref + t; + return av_clip_uintp2(ref + t, 7); } -static int mpc7_decode_frame(AVCodecContext * avctx, - void *data, int *data_size, - AVPacket *avpkt) +static int mpc7_decode_frame(AVCodecContext * avctx, void *data, + int *got_frame_ptr, AVPacket *avpkt) { + AVFrame *frame = data; const uint8_t *buf = avpkt->data; - int buf_size = avpkt->size; + int buf_size; MPCContext *c = avctx->priv_data; GetBitContext gb; - uint8_t *bits; - int i, ch, t; + int i, ch; int mb = -1; Band *bands = c->bands; - int off; + int off, ret, last_frame, skip; int bits_used, bits_avail; - memset(bands, 0, sizeof(bands)); - if(buf_size <= 4){ - av_log(avctx, AV_LOG_ERROR, "Too small buffer passed (%i bytes)\n", buf_size); + memset(bands, 0, sizeof(*bands) * (c->maxbands + 1)); + + buf_size = avpkt->size & ~3; + if (buf_size <= 0) { + av_log(avctx, AV_LOG_ERROR, "packet size is too small (%i bytes)\n", + avpkt->size); + return AVERROR_INVALIDDATA; + } + if (buf_size != avpkt->size) { + av_log(avctx, AV_LOG_WARNING, "packet size is not a multiple of 4. " + "extra bytes at the end will be skipped.\n"); + } + + skip = buf[0]; + last_frame = buf[1]; + buf += 4; + buf_size -= 4; + + /* get output buffer */ + frame->nb_samples = last_frame ? c->lastframelen : MPC_FRAME_SIZE; + if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) { + av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); + return ret; } - bits = av_malloc(((buf_size - 1) & ~3) + FF_INPUT_BUFFER_PADDING_SIZE); - c->dsp.bswap_buf((uint32_t*)bits, (const uint32_t*)(buf + 4), (buf_size - 4) >> 2); - init_get_bits(&gb, bits, (buf_size - 4)* 8); - skip_bits(&gb, buf[0]); + av_fast_padded_malloc(&c->bits, &c->buf_size, buf_size); + if (!c->bits) + return AVERROR(ENOMEM); + c->bdsp.bswap_buf((uint32_t *) c->bits, (const uint32_t *) buf, + buf_size >> 2); + init_get_bits(&gb, c->bits, buf_size * 8); + skip_bits_long(&gb, skip); /* read subband indexes */ for(i = 0; i <= c->maxbands; i++){ for(ch = 0; ch < 2; ch++){ + int t = 4; if(i) t = get_vlc2(&gb, hdr_vlc.table, MPC7_HDR_BITS, 1) - 5; - if(!i || (t == 4)) bands[i].res[ch] = get_bits(&gb, 4); - else bands[i].res[ch] = bands[i-1].res[ch] + t; + if(t == 4) bands[i].res[ch] = get_bits(&gb, 4); + else bands[i].res[ch] = av_clip(bands[i-1].res[ch] + t, 0, 17); } if(bands[i].res[0] || bands[i].res[1]){ @@ -259,24 +292,23 @@ static int mpc7_decode_frame(AVCodecContext * avctx, for(ch = 0; ch < 2; ch++) idx_to_quant(c, &gb, bands[i].res[ch], c->Q[ch] + off); - ff_mpc_dequantize_and_synth(c, mb, data); - - av_free(bits); + ff_mpc_dequantize_and_synth(c, mb, (int16_t **)frame->extended_data, 2); bits_used = get_bits_count(&gb); - bits_avail = (buf_size - 4) * 8; - if(!buf[1] && ((bits_avail < bits_used) || (bits_used + 32 <= bits_avail))){ - av_log(NULL,0, "Error decoding frame: used %i of %i bits\n", bits_used, bits_avail); + bits_avail = buf_size * 8; + if (!last_frame && ((bits_avail < bits_used) || (bits_used + 32 <= bits_avail))) { + av_log(avctx, AV_LOG_ERROR, "Error decoding frame: used %i of %i bits\n", bits_used, bits_avail); return -1; } if(c->frames_to_skip){ c->frames_to_skip--; - *data_size = 0; - return buf_size; + *got_frame_ptr = 0; + return avpkt->size; } - *data_size = (buf[1] ? c->lastframelen : MPC_FRAME_SIZE) * 4; - return buf_size; + *got_frame_ptr = 1; + + return avpkt->size; } static void mpc7_decode_flush(AVCodecContext *avctx) @@ -287,15 +319,25 @@ static void mpc7_decode_flush(AVCodecContext *avctx) c->frames_to_skip = 32; } -AVCodec mpc7_decoder = { - "mpc7", - CODEC_TYPE_AUDIO, - CODEC_ID_MUSEPACK7, - sizeof(MPCContext), - mpc7_decode_init, - NULL, - NULL, - mpc7_decode_frame, - .flush = mpc7_decode_flush, - .long_name = NULL_IF_CONFIG_SMALL("Musepack SV7"), +static av_cold int mpc7_decode_close(AVCodecContext *avctx) +{ + MPCContext *c = avctx->priv_data; + av_freep(&c->bits); + c->buf_size = 0; + return 0; +} + +AVCodec ff_mpc7_decoder = { + .name = "mpc7", + .long_name = NULL_IF_CONFIG_SMALL("Musepack SV7"), + .type = AVMEDIA_TYPE_AUDIO, + .id = AV_CODEC_ID_MUSEPACK7, + .priv_data_size = sizeof(MPCContext), + .init = mpc7_decode_init, + .close = mpc7_decode_close, + .decode = mpc7_decode_frame, + .flush = mpc7_decode_flush, + .capabilities = AV_CODEC_CAP_DR1, + .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P, + AV_SAMPLE_FMT_NONE }, };