diff options
Diffstat (limited to 'libavcodec/alac.c')
| -rw-r--r-- | libavcodec/alac.c | 91 |
1 files changed, 72 insertions, 19 deletions
diff --git a/libavcodec/alac.c b/libavcodec/alac.c index 1a3f769513..180ef53105 100644 --- a/libavcodec/alac.c +++ b/libavcodec/alac.c @@ -2,20 +2,20 @@ * ALAC (Apple Lossless Audio Codec) decoder * Copyright (c) 2005 David Hammerton * - * This file is part of Libav. + * This file is part of FFmpeg. * - * Libav is free software; you can redistribute it and/or + * 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. * - * Libav is distributed in the hope that it will be useful, + * 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 Libav; if not, write to the Free Software + * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ @@ -74,6 +74,8 @@ typedef struct { int extra_bits; /**< number of extra bits beyond 16-bit */ int nb_samples; /**< number of samples in the current frame */ + + int direct_output; } ALACContext; static inline unsigned int decode_scalar(GetBitContext *gb, int k, int bps) @@ -98,7 +100,7 @@ static inline unsigned int decode_scalar(GetBitContext *gb, int k, int bps) return x; } -static void rice_decompress(ALACContext *alac, int32_t *output_buffer, +static int rice_decompress(ALACContext *alac, int32_t *output_buffer, int nb_samples, int bps, int rice_history_mult) { int i; @@ -109,6 +111,9 @@ static void rice_decompress(ALACContext *alac, int32_t *output_buffer, int k; unsigned int x; + if(get_bits_left(&alac->gb) <= 0) + return -1; + /* calculate rice param and decode next value */ k = av_log2((history >> 9) + 3); k = FFMIN(k, alac->rice_limit); @@ -149,6 +154,7 @@ static void rice_decompress(ALACContext *alac, int32_t *output_buffer, history = 0; } } + return 0; } static inline int sign_only(int v) @@ -185,7 +191,7 @@ static void lpc_prediction(int32_t *error_buffer, int32_t *buffer_out, } /* read warm-up samples */ - for (i = 1; i <= lpc_order; i++) + for (i = 1; i <= lpc_order && i < nb_samples; i++) buffer_out[i] = sign_extend(buffer_out[i - 1] + error_buffer[i], bps); /* NOTE: 4 and 8 are very common cases that could be optimized. */ @@ -264,7 +270,7 @@ static int decode_element(AVCodecContext *avctx, void *data, int ch_index, alac->extra_bits = get_bits(&alac->gb, 2) << 3; bps = alac->sample_size - alac->extra_bits + channels - 1; - if (bps > 32) { + if (bps > 32U) { av_log(avctx, AV_LOG_ERROR, "bps is unsupported: %d\n", bps); return AVERROR_PATCHWELCOME; } @@ -294,7 +300,7 @@ static int decode_element(AVCodecContext *avctx, void *data, int ch_index, return AVERROR_INVALIDDATA; } alac->nb_samples = output_samples; - if (alac->sample_size > 16) { + if (alac->direct_output) { for (ch = 0; ch < channels; ch++) alac->output_samples_buffer[ch] = (int32_t *)alac->frame.extended_data[ch_index + ch]; } @@ -322,14 +328,18 @@ static int decode_element(AVCodecContext *avctx, void *data, int ch_index, if (alac->extra_bits) { for (i = 0; i < alac->nb_samples; i++) { + if(get_bits_left(&alac->gb) <= 0) + return -1; for (ch = 0; ch < channels; ch++) alac->extra_bits_buffer[ch][i] = get_bits(&alac->gb, alac->extra_bits); } } for (ch = 0; ch < channels; ch++) { - rice_decompress(alac, alac->predict_error_buffer[ch], + int ret=rice_decompress(alac, alac->predict_error_buffer[ch], alac->nb_samples, bps, rice_history_mult[ch] * alac->rice_history_mult / 4); + if(ret<0) + return ret; /* adaptive FIR filter */ if (prediction_type[ch] == 15) { @@ -354,6 +364,8 @@ static int decode_element(AVCodecContext *avctx, void *data, int ch_index, } else { /* not compressed, easy case */ for (i = 0; i < alac->nb_samples; i++) { + if(get_bits_left(&alac->gb) <= 0) + return -1; for (ch = 0; ch < channels; ch++) { alac->output_samples_buffer[ch][i] = get_sbits_long(&alac->gb, alac->sample_size); @@ -374,6 +386,7 @@ static int decode_element(AVCodecContext *avctx, void *data, int ch_index, alac->extra_bits, channels, alac->nb_samples); } + if(av_sample_fmt_is_planar(avctx->sample_fmt)) { switch(alac->sample_size) { case 16: { for (ch = 0; ch < channels; ch++) { @@ -389,6 +402,37 @@ static int decode_element(AVCodecContext *avctx, void *data, int ch_index, }} break; } + }else{ + switch(alac->sample_size) { + case 16: { + int16_t *outbuffer = ((int16_t *)alac->frame.extended_data[0]) + ch_index; + for (i = 0; i < alac->nb_samples; i++) { + for (ch = 0; ch < channels; ch++) + *outbuffer++ = alac->output_samples_buffer[ch][i]; + outbuffer += alac->channels - channels; + } + } + break; + case 24: { + int32_t *outbuffer = ((int32_t *)alac->frame.extended_data[0]) + ch_index; + for (i = 0; i < alac->nb_samples; i++) { + for (ch = 0; ch < channels; ch++) + *outbuffer++ = alac->output_samples_buffer[ch][i] << 8; + outbuffer += alac->channels - channels; + } + } + break; + case 32: { + int32_t *outbuffer = ((int32_t *)alac->frame.extended_data[0]) + ch_index; + for (i = 0; i < alac->nb_samples; i++) { + for (ch = 0; ch < channels; ch++) + *outbuffer++ = alac->output_samples_buffer[ch][i]; + outbuffer += alac->channels - channels; + } + } + break; + } + } return 0; } @@ -413,12 +457,14 @@ static int alac_decode_frame(AVCodecContext *avctx, void *data, break; } if (element > TYPE_CPE && element != TYPE_LFE) { - av_log(avctx, AV_LOG_ERROR, "syntax element unsupported: %d", element); + av_log(avctx, AV_LOG_ERROR, "syntax element unsupported: %d\n", element); return AVERROR_PATCHWELCOME; } channels = (element == TYPE_CPE) ? 2 : 1; - if (ch + channels > alac->channels) { + if ( ch + channels > alac->channels + || ff_alac_channel_layout_offsets[alac->channels - 1][ch] + channels > alac->channels + ) { av_log(avctx, AV_LOG_ERROR, "invalid element channel count\n"); return AVERROR_INVALIDDATA; } @@ -454,7 +500,7 @@ static av_cold int alac_decode_close(AVCodecContext *avctx) int ch; for (ch = 0; ch < FFMIN(alac->channels, 2); ch++) { av_freep(&alac->predict_error_buffer[ch]); - if (alac->sample_size == 16) + if (!alac->direct_output) av_freep(&alac->output_samples_buffer[ch]); av_freep(&alac->extra_bits_buffer[ch]); } @@ -465,13 +511,18 @@ static av_cold int alac_decode_close(AVCodecContext *avctx) static int allocate_buffers(ALACContext *alac) { int ch; - int buf_size = alac->max_samples_per_frame * sizeof(int32_t); + int buf_size; + + if (alac->max_samples_per_frame > INT_MAX / sizeof(int32_t)) + goto buf_alloc_fail; + buf_size = alac->max_samples_per_frame * sizeof(int32_t); for (ch = 0; ch < FFMIN(alac->channels, 2); ch++) { FF_ALLOC_OR_GOTO(alac->avctx, alac->predict_error_buffer[ch], buf_size, buf_alloc_fail); - if (alac->sample_size == 16) { + alac->direct_output = alac->sample_size > 16 && av_sample_fmt_is_planar(alac->avctx->sample_fmt); + if (!alac->direct_output) { FF_ALLOC_OR_GOTO(alac->avctx, alac->output_samples_buffer[ch], buf_size, buf_alloc_fail); } @@ -517,24 +568,26 @@ static int alac_set_info(ALACContext *alac) static av_cold int alac_decode_init(AVCodecContext * avctx) { int ret; + int req_packed; ALACContext *alac = avctx->priv_data; alac->avctx = avctx; /* initialize from the extradata */ if (alac->avctx->extradata_size < ALAC_EXTRADATA_SIZE) { - av_log(avctx, AV_LOG_ERROR, "alac: extradata is too small\n"); + av_log(avctx, AV_LOG_ERROR, "extradata is too small\n"); return AVERROR_INVALIDDATA; } if (alac_set_info(alac)) { - av_log(avctx, AV_LOG_ERROR, "alac: set_info failed\n"); + av_log(avctx, AV_LOG_ERROR, "set_info failed\n"); return -1; } + req_packed = LIBAVCODEC_VERSION_MAJOR < 55 && !av_sample_fmt_is_planar(avctx->request_sample_fmt); switch (alac->sample_size) { - case 16: avctx->sample_fmt = AV_SAMPLE_FMT_S16P; + case 16: avctx->sample_fmt = req_packed ? AV_SAMPLE_FMT_S16 : AV_SAMPLE_FMT_S16P; break; case 24: - case 32: avctx->sample_fmt = AV_SAMPLE_FMT_S32P; + case 32: avctx->sample_fmt = req_packed ? AV_SAMPLE_FMT_S32 : AV_SAMPLE_FMT_S32P; break; default: av_log_ask_for_sample(avctx, "Sample depth %d is not supported.\n", alac->sample_size); @@ -551,7 +604,7 @@ static av_cold int alac_decode_init(AVCodecContext * avctx) else avctx->channels = alac->channels; } - if (avctx->channels > ALAC_MAX_CHANNELS) { + if (avctx->channels > ALAC_MAX_CHANNELS || avctx->channels <= 0 ) { av_log(avctx, AV_LOG_ERROR, "Unsupported channel count: %d\n", avctx->channels); return AVERROR_PATCHWELCOME; |