Exemple #1
0
static void parse_superframe_index(const uint8_t *data, size_t data_sz,
                                   uint32_t sizes[8], int *count,
                                   vpx_decrypt_cb decrypt_cb,
                                   void *decrypt_state) {
  uint8_t marker;

  assert(data_sz);
  marker = read_marker(decrypt_cb, decrypt_state, data + data_sz - 1);
  *count = 0;

  if ((marker & 0xe0) == 0xc0) {
    const uint32_t frames = (marker & 0x7) + 1;
    const uint32_t mag = ((marker >> 3) & 0x3) + 1;
    const size_t index_sz = 2 + mag * frames;

    uint8_t marker2 = read_marker(decrypt_cb, decrypt_state,
                                  data + data_sz - index_sz);

    if (data_sz >= index_sz && marker2 == marker) {
      // found a valid superframe index
      uint32_t i, j;
      const uint8_t *x = &data[data_sz - index_sz + 1];

      // frames has a maximum of 8 and mag has a maximum of 4.
      uint8_t clear_buffer[32];
      assert(sizeof(clear_buffer) >= frames * mag);
      if (decrypt_cb) {
        decrypt_cb(decrypt_state, x, clear_buffer, frames * mag);
        x = clear_buffer;
      }

      for (i = 0; i < frames; i++) {
        uint32_t this_sz = 0;

        for (j = 0; j < mag; j++)
          this_sz |= (*x++) << (j * 8);
        sizes[i] = this_sz;
      }

      *count = frames;
    }
  }
}
Exemple #2
0
static vpx_codec_err_t decode_one_iter(vpx_codec_alg_priv_t *ctx,
                                       const uint8_t **data_start_ptr,
                                       const uint8_t *data_end,
                                       uint32_t frame_size, void *user_priv,
                                       long deadline) {
  const vpx_codec_err_t res = decode_one(ctx, data_start_ptr, frame_size,
                                         user_priv, deadline);
  if (res != VPX_CODEC_OK)
    return res;

  // Account for suboptimal termination by the encoder.
  while (*data_start_ptr < data_end) {
    const uint8_t marker = read_marker(ctx->decrypt_cb, ctx->decrypt_state,
                                       *data_start_ptr);
    if (marker)
      break;
    (*data_start_ptr)++;
  }

  return VPX_CODEC_OK;
}
static vpx_codec_err_t decoder_decode(vpx_codec_alg_priv_t *ctx,
                                      const uint8_t *data, unsigned int data_sz,
                                      void *user_priv, long deadline) {
  const uint8_t *data_start = data;
  const uint8_t * const data_end = data + data_sz;
  vpx_codec_err_t res;
  uint32_t frame_sizes[8];
  int frame_count;

  if (data == NULL && data_sz == 0) {
    ctx->flushed = 1;
    return VPX_CODEC_OK;
  }

  // Reset flushed when receiving a valid frame.
  ctx->flushed = 0;

  // Initialize the decoder workers on the first frame.
  if (ctx->frame_workers == NULL) {
    const vpx_codec_err_t res = init_decoder(ctx);
    if (res != VPX_CODEC_OK)
      return res;
  }

  res = vp9_parse_superframe_index(data, data_sz, frame_sizes, &frame_count,
                                   ctx->decrypt_cb, ctx->decrypt_state);
  if (res != VPX_CODEC_OK)
    return res;

  if (ctx->frame_parallel_decode) {
    // Decode in frame parallel mode. When decoding in this mode, the frame
    // passed to the decoder must be either a normal frame or a superframe with
    // superframe index so the decoder could get each frame's start position
    // in the superframe.
    if (frame_count > 0) {
      int i;

      for (i = 0; i < frame_count; ++i) {
        const uint8_t *data_start_copy = data_start;
        const uint32_t frame_size = frame_sizes[i];
        if (data_start < data
            || frame_size > (uint32_t) (data_end - data_start)) {
          set_error_detail(ctx, "Invalid frame size in index");
          return VPX_CODEC_CORRUPT_FRAME;
        }

        if (ctx->available_threads == 0) {
          // No more threads for decoding. Wait until the next output worker
          // finishes decoding. Then copy the decoded frame into cache.
          if (ctx->num_cache_frames < FRAME_CACHE_SIZE) {
            wait_worker_and_cache_frame(ctx);
          } else {
            // TODO(hkuang): Add unit test to test this path.
            set_error_detail(ctx, "Frame output cache is full.");
            return VPX_CODEC_ERROR;
          }
        }

        res = decode_one(ctx, &data_start_copy, frame_size, user_priv,
                         deadline);
        if (res != VPX_CODEC_OK)
          return res;
        data_start += frame_size;
      }
    } else {
      if (ctx->available_threads == 0) {
        // No more threads for decoding. Wait until the next output worker
        // finishes decoding. Then copy the decoded frame into cache.
        if (ctx->num_cache_frames < FRAME_CACHE_SIZE) {
          wait_worker_and_cache_frame(ctx);
        } else {
          // TODO(hkuang): Add unit test to test this path.
          set_error_detail(ctx, "Frame output cache is full.");
          return VPX_CODEC_ERROR;
        }
      }

      res = decode_one(ctx, &data, data_sz, user_priv, deadline);
      if (res != VPX_CODEC_OK)
        return res;
    }
  } else {
    // Decode in serial mode.
    if (frame_count > 0) {
      int i;

      for (i = 0; i < frame_count; ++i) {
        const uint8_t *data_start_copy = data_start;
        const uint32_t frame_size = frame_sizes[i];
        vpx_codec_err_t res;
        if (data_start < data
            || frame_size > (uint32_t) (data_end - data_start)) {
          set_error_detail(ctx, "Invalid frame size in index");
          return VPX_CODEC_CORRUPT_FRAME;
        }

        res = decode_one(ctx, &data_start_copy, frame_size, user_priv,
                         deadline);
        if (res != VPX_CODEC_OK)
          return res;

        data_start += frame_size;
      }
    } else {
      while (data_start < data_end) {
        const uint32_t frame_size = (uint32_t) (data_end - data_start);
        const vpx_codec_err_t res = decode_one(ctx, &data_start, frame_size,
                                               user_priv, deadline);
        if (res != VPX_CODEC_OK)
          return res;

        // Account for suboptimal termination by the encoder.
        while (data_start < data_end) {
          const uint8_t marker = read_marker(ctx->decrypt_cb,
                                             ctx->decrypt_state, data_start);
          if (marker)
            break;
          ++data_start;
        }
      }
    }
  }

  return res;
}
Exemple #4
0
vpx_codec_err_t vp9_parse_superframe_index(const uint8_t *data,
                                           size_t data_sz,
                                           uint32_t sizes[8], int *count,
                                           vpx_decrypt_cb decrypt_cb,
                                           void *decrypt_state) {
  // A chunk ending with a byte matching 0xc0 is an invalid chunk unless
  // it is a super frame index. If the last byte of real video compression
  // data is 0xc0 the encoder must add a 0 byte. If we have the marker but
  // not the associated matching marker byte at the front of the index we have
  // an invalid bitstream and need to return an error.

  uint8_t marker;

  assert(data_sz);
  marker = read_marker(decrypt_cb, decrypt_state, data + data_sz - 1);
  *count = 0;

  if ((marker & 0xe0) == 0xc0) {
    const uint32_t frames = (marker & 0x7) + 1;
    const uint32_t mag = ((marker >> 3) & 0x3) + 1;
    const size_t index_sz = 2 + mag * frames;

    // This chunk is marked as having a superframe index but doesn't have
    // enough data for it, thus it's an invalid superframe index.
    if (data_sz < index_sz)
      return VPX_CODEC_CORRUPT_FRAME;

    {
      const uint8_t marker2 = read_marker(decrypt_cb, decrypt_state,
                                          data + data_sz - index_sz);

      // This chunk is marked as having a superframe index but doesn't have
      // the matching marker byte at the front of the index therefore it's an
      // invalid chunk.
      if (marker != marker2)
        return VPX_CODEC_CORRUPT_FRAME;
    }

    {
      // Found a valid superframe index.
      uint32_t i, j;
      const uint8_t *x = &data[data_sz - index_sz + 1];

      // Frames has a maximum of 8 and mag has a maximum of 4.
      uint8_t clear_buffer[32];
      assert(sizeof(clear_buffer) >= frames * mag);
      if (decrypt_cb) {
        decrypt_cb(decrypt_state, x, clear_buffer, frames * mag);
        x = clear_buffer;
      }

      for (i = 0; i < frames; ++i) {
        uint32_t this_sz = 0;

        for (j = 0; j < mag; ++j)
          this_sz |= (*x++) << (j * 8);
        sizes[i] = this_sz;
      }
      *count = frames;
    }
  }
  return VPX_CODEC_OK;
}